How long does a root canal last?

Tooth Sensitivity and Root Canals with Endodontist Dr. Graham Locke

Best Answer

With a well-fitted crown and good personal and professional dental care, these teeth should last a long time.

Yes.

With proper care and maintenance, teeth that have had a root canal can last for a lifetime.

Your dentist may recommend additional treatment to protect the root canal treated tooth.

Dental Crowns - Everything they didn't tell you

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How long does a root canal take?

Patients are often curious how long a root canal takes to finish. They can generally expect one or two appointments of about 90 minutes each. An endodontist, and some general dentists, will often perform root canal treatment using a microscope that attaches to the wall and hangs over the patient's mouth.

How long does a canine root canal take?

Patients are often curious how long a root canal takes to finish. They can generally expect one or two appointments of about 90 minutes each. An endodontist, and some general dentists, will often perform root canal treatment using a microscope that attaches to the wall and hangs over the patient's mouth.

How long does a root canal take to heal?

A successful root canal can cause mild pain for a few days. This is temporary, and should go away on its own as long as you practice good oral hygiene. You should see your dentist for a follow-up if the pain lasts longer than three days.

ROOT CANALS; NOT always necessary!!

How long does a root canal take for one tooth?

Patients are often curious how long a root canal takes to finish. They can generally expect one or two appointments of about 90 minutes each. An endodontist, and some general dentists, will often perform root canal treatment using a microscope that attaches to the wall and hangs over the patient's mouth.

How long does it take to heal after root canal?

A successful root canal can cause mild pain for a few days. This is temporary, and should go away on its own as long as you practice good oral hygiene. You should see your dentist for a follow-up if the pain lasts longer than three days.

Does a root canal require a crown?

In these cases, you may need the strength crowns provide. Premolars and molars that are at low risk of fracture may also be suitable for filling-only restorations after root canals. Front teeth may not need a crown for strength, but you might still refer the improved appearance a crown offers.

Does a root canal kill the nerve?

In a nutshell, root canal therapy involves drilling into the tooth and removing the infected pulp, then drilling the nerves out of the root canals (hence the assumed name of the procedure). As you can likely guess, the root canal therapy will “kill” the tooth, as almost all the nerves and blood vessels are removed.

How much does a root canal cost for a dog?

Root canals in dogs and cats cost roughly the same as they do for humans. $1,500 to $3,000 or more is common. The canine tooth in a large dog, in particular, can be very expensive. Depending on the geographic location, a root canal performed on this tooth can cost up to $6,000.

Say NO to Root Canals - Damaging to your Health

How painful is a root canal?

Most people associate having a root canal with a lot of pain and discomfort. A root canal will treat the diseased tissue (pulp) while preserving the rest of the tooth. A person will be given anesthetic before the procedure, so it is usually no more painful than a typical dental filling.

How much does it cost to redo a root canal?

The price range for a root canal is very wide and can cost as little as $300 up to $2,000 or more. Many factors influence the cost of the procedure including the location of the tooth, the severity of the decay, and the amount of restoration the tooth needs post-treatment.

How long after root canal can I eat?

When can you eat after a root canal? Until your root canal procedure is finished and the permanent filling or crown is in place, it is wise to minimize chewing on the tooth under repair. You can eat as soon as the numbness wears off. Waiting until it wears off will prevent you from biting your tongue or cheek.

How long can you eat after root canal?

When can you eat after a root canal? Until your root canal procedure is finished and the permanent filling or crown is in place, it is wise to minimize chewing on the tooth under repair. You can eat as soon as the numbness wears off. Waiting until it wears off will prevent you from biting your tongue or cheek.

Is root canal necessary?

Why would I need an endodontic procedure? Endodontic treatment is necessary when the pulp, the soft tissue inside the root canal, becomes inflamed or infected. The inflammation or infection can have a variety of causes: deep decay repeated dental procedures on the tooth or a crack or chip in the tooth.

ROOT CANAL up close & personal!

How many visits does a root canal take?

Usually in 1 appointment if it's not a complicated or infected tooth. The higher the degree of complexity the easier it is on both the dentist and the patient to complete the treatment over 2 or even 3 appointments. Root canals may be treated in one or multiple visits. Most root canals can be treated in one visit.

Can a root canal fail?

If one of these canals is missed and not treated, an infection will ultimately develop and can potentially form a painful abscess. Obstruction: An obstruction (such as another tooth, filling material, etc.) may make it impossible for the dentist to reach and thoroughly clean the entirety of the canal affected.

How long does it take to put a crown on after root canal?

It typically takes a dentist two separate appointments to make and place a new dental crown for a patient. The first appointment involves: 1) Preparing (shaping) the tooth, 2) Taking its impression and 3) Placing a temporary crown. The time needed to perform these steps typically ranges from 50 to 90 minutes.

Can a dog get a root canal?

For the large canine teeth in dogs and cats, and the large chewing (carnassial) teeth in dogs, the extraction procedure can be traumatic and painful due to the size of the roots in our animal patients. The root of the canine tooth is longer and wider than the crown (the part of the tooth you can see above the gums).

Are root canals expensive?

The cost of a root canal varies depending on where you are in the country — and which tooth needs it. Molars are significantly more expensive than bicuspids and front teeth. For a molar root canal you're looking at spending between $500 to $2,000, with typical costs between $1,000 to $1,300.

Has anyone died from a root canal?

In the days after Christopher Schutzius, 17. Schutzius died of sepsis, a toxic infection, following the root canal, the Cook County medical examiner's office ruled after an autopsy Thursday. Several medical experts said it is rare for serious complications to occur because of a root canal.

Can a root canal make you sick?

Myth #2: Root canals are dangerous and make you sick. Reality: One debunked study means root canals are healthy. Getting a root canal will not spread bacteria throughout your body, and you will not get sick from it. Myth #3: You need a root canal only if you have a bad toothache.

Can a root canal kill you?

As you can likely guess, the root canal therapy will “kill” the tooth, as almost all the nerves and blood vessels are removed. This is why, in most cases, a crown is almost always recommended after a root canal. However, there are plenty of naysayers, and even some who say root canal therapy can be harmful.

Can you die from a root canal?

Schutzius died of sepsis, a toxic infection, following the root canal, the Cook County medical examiner's office ruled after an autopsy Thursday. Several medical experts said it is rare for serious complications to occur because of a root canal.

Can you avoid a root canal?

In addition, if you play contact sports, a mouthguard will help prevent trauma to the teeth. The best way to prevent a root canal is to prevent the cavity or trauma that may lead to a root canal in the first place. A root canal is needed when the pulp, or nerve, tissue inside the tooth begins to die.

Is root canal painful?

Most people associate having a root canal with a lot of pain and discomfort. However, while most people can expect some discomfort during and after a root canal procedure, excessive pain is not normal. A root canal will treat the diseased tissue (pulp) while preserving the rest of the tooth.

Can root canals wait?

The only root canal pain you'll feel will be from the problem before treatment. You may have to wait a few days for your dentist or a specialist in endodontics in Collingdale to perform the procedure.

Can root canals fail?

A root canal fails when a tooth that has been previously treated with a root canal procedure becomes infected at the root. If this infection is allowed to continue to develop without proper treatment, the infection can potentially spread to other teeth in the area or cause illness in other parts of the body.

How do you know when a root canal fails?

Once root canal therapy has been completed and adequate time has passed to allow the tooth to recover from infection or inflammation, the tooth should be back to normal function. Signs and symptoms of failed root canal therapy include sensitivity to cold or hot, swelling, and/or pain from chewing.

Why does a root canal take two visits?

Root canal treatment removes all infection from the root system of the tooth. Most root treatments involve at least two visits to your dentist. On the second visit the root canal is cleaned, disinfected, shaped, measured and filled to prevent any further infection.

Can a root canal go bad?

Several factors may lead to reinfection of the tooth, sending you back to your dental professional for root canal retreatment. And it's important to note that you may not experience the symptoms of failed root canal therapy right away. They can occur months or even years after the original procedure is performed.

Can you talk after a root canal?

After a root canal, your tooth will be numb for several hours after the procedure. You will need to be careful to not bite your lip, cheek, and tongue during this time. Once the root canal is finished, the top part of the tooth will need to be treated with either a filling or a crown.

Can I drive after a root canal?

Our endodontists use a local anesthesia to eliminate discomfort. You will be able to drive home after your treatment, and you probably will be comfortable returning to your normal routine soon after treatment. Generally, a root canal is all that is needed to save teeth with injured pulp from extraction.

Why root canal is dangerous?

Most dentists will agree that indeed, some can become toxic and dangerousbut whether this leads to an abscessed tooth or can cause other diseases is another issue. On the one hand, the Dental Association's insist that root canal-treated teeth do not cause or contribute to any systemic disease.

Are root canals really necessary?

Why would I need an endodontic procedure? Endodontic treatment is necessary when the pulp, the soft tissue inside the root canal, becomes inflamed or infected. The inflammation or infection can have a variety of causes: deep decay repeated dental procedures on the tooth or a crack or chip in the tooth.

Can dogs have root canals?

When root canal therapy is performed on dogs or cats, the tooth usually does not need a crown since the opening made to perform the root canal is very small. In certain cases, metal crown placement is considered to provide additional protection to teeth that have root canals.

Is root canal treatment painful?

However, the pain you feel is usually caused by an infection or injury in the tooth, not the root canal treatment itself. On the contrary, root canal therapy also known as endodontic therapy is performed to eliminate pain. A root canal procedure is painless during the procedure due to modern medicine.

Do root canals hurt after?

A root canal is a major procedure, so pain after a root canal is normal. It's normal to experience mild to moderate pain for a few days after a root canal. Any pain beyond this point may warrant additional cleaning of the canals or other procedures from your dentist.

Do dogs need root canals?

When root canal therapy is performed on dogs or cats, the tooth usually does not need a crown since the opening made to perform the root canal is very small. The majority of teeth that are fractured or have pulpitis can receive root canal therapy. Even teeth with abscesses can often be saved.

How long after a root canal can I eat or drink?

No spitting or using a straw for the first 24 hours. Try to eat soft foods for the first couple of days. Avoid hard, crunchy things and very hot things like soups. Yogurt, eggs, ice cream, mashed potatoes, and applesauce are some good examples of things to eat during the first 24 hours.

How much pain is normal after a root canal?

Some amount of soreness after a root canal is normal. However, if you are still experiencing a tooth ache or pain for longer than a few days, you should contact your dentist right away.

How much is a root canal and crown without insurance?

The short answer is somewhere around the neighborhood of $1,000, depending on which tooth needs it, among other factors. Here are the average prices of a root canal by tooth: Front teeth: The cost will range anywhere from $300 to $1,500, but a more typical range will be $900 to $1,100.

How do you feel after a root canal?

What Should One Expect After the Root Canal? For the first few days following the completion of a root canal, the tooth may feel sensitive due to natural tissue inflammation, especially if there was pain or infection before the procedure.

How much is a root canal out of pocket?

Here are the average prices of a root canal by tooth: Front teeth: The cost will range anywhere from $300 to $1,500, but a more typical range will be $900 to $1,100. Bicuspids: The cost of a bicuspid root canal is a little steeper, ranging from $400 to $1,800 with a typical cost of $900 to $1,100.

How do you stop a root canal from hurting?

Pain After Root Canal Procedure: What You Can Do Call your Endodontist! If you are experiencing continued pain after your procedure, contact your Endodontist immediately. Apply an ice pack to soothe and calm the pain. Over-the-counter pain medication. Try a saltwater gargle. Sleep with elevated pillows.

Is a crown necessary after a root canal?

In these cases, you may need the strength crowns provide. Premolars and molars that are at low risk of fracture may also be suitable for filling-only restorations after root canals. Your dentist can ultimately help you determine the best option for restoring a tooth after a root canal.

Can a root canal be done on a canine tooth?

Root canal treatment is usually carried out under local anaesthetic, a painkilling medication that numbs a specific area of the body. In some cases where the tooth has died and is no longer sensitive, it may not be necessary to use a local anaesthetic. Occasionally, teeth may be difficult to anaesthetise.

Why would a dog need a root canal?

When dogs break their teeth and the pulp is exposed, bacterial and oral debris enter into the center of the tooth, eventually causing the nerves and blood vessels to die. Once a tooth is broken with the pulp exposed the only two choices for treatment are root canal therapy, which usually saves the tooth, or extraction.

Can you talk after root canal?

After a root canal, your tooth will be numb for several hours after the procedure. You will need to be careful to not bite your lip, cheek, and tongue during this time. Once the root canal is finished, the top part of the tooth will need to be treated with either a filling or a crown.

Is Crown necessary after root canal?

Patients often wonder if it will be necessary to add a dental crown after a root canal is performed. The average patient is intimidated by the root canal procedure in and of itself. Dental crowns are typically required on molars, premolars and other teeth toward the rear of the mouth following a root canal.

Are root canals covered by insurance?

Your cost will be much lower if you have dental insurance. Most plans cover 50% to 90% of reparative procedures like root canals, fillings and crowns after a deductible is met. Dental insurance deductibles are usually less than $200.

Can you drive after root canal?

Our endodontists use a local anesthesia to eliminate discomfort. You will be able to drive home after your treatment, and you probably will be comfortable returning to your normal routine soon after treatment. Generally, a root canal is all that is needed to save teeth with injured pulp from extraction.

Do you need antibiotics after root canal?

If there is a lot of infection, an antibiotic may be prescribed. Generally ibuprofen or tylenol is all that is needed after a root canal. For more involved root canal procedures your dentist may prescribe a pain medicine. Antibiotics tend to be over-prescribed but may also be needed depending on the pathogenicity.

Can a tooth that needs a root canal heal itself?

If your tooth is infected, the pulp can't heal by itself. There may also be less chance of the root canal treatment working if the infection within your tooth becomes established.

Can a tooth hurt after a root canal?

Most often people can expect mild discomfort after root canal treatment that may last from a few days to several weeks. It is possible for your tooth to be sensitive after a root canal. The tooth may be sore from the infection that led you to need a root canal and that should subside in a day or two.

Can a tooth hurt years after a root canal?

But sometimes, a tooth that has been treated doesn't heal properly and can become painful or diseased months or even years after treatment. An additional procedure may be able to support healing and save your tooth. If you have pain or discomfort in a previously treated tooth, talk to an endodontist about retreatment.

Can antibiotics heal an infected root canal?

If the affected tooth can't be saved, your dentist will pull (extract) the tooth and drain the abscess to get rid of the infection. Prescribe antibiotics. If the infection is limited to the abscessed area, you may not need antibiotics.

Do all root canals eventually fail?

The vast majority of failed root canals happen to people who have barriers to oral hygiene or who are unable to quickly have the tooth adequately restored with a final restoration (filling, crown, etc.). Depending on the reason for root canal failure, it is often possible to perform a root canal retreatment.

Which is better root canal or extraction?

Between a root canal and a tooth extraction, a root canal is often the preferred choice because it works on fixing your natural tooth so that it could remain in place. If a tooth is far too compromised, your dentist might recommend an extraction, followed by a dental implant to replace what was lost.

How much does it cost to get a root canal and crown?

But how much does root canal treatment cost? The average price of a root canal ranges from approximately $300 to $2,000 depending on your insurance, location and dentist. At Kool Smiles, we have many affordable treatment options. Call us today to speak with a dental expert about your root canal and crown procedure.

How do you know if root canal is needed?

Signs you may need root canal therapy include: Severe toothache pain upon chewing or application of pressure. Prolonged sensitivity (pain) to hot or cold temperatures (after the heat or cold has been removed) Discoloration (darkening) of the tooth. Swelling and tenderness in nearby gums.

Do you have to take antibiotics before a root canal?

If there is a lot of infection, an antibiotic may be prescribed. Generally ibuprofen or tylenol is all that is needed after a root canal. For more involved root canal procedures your dentist may prescribe a pain medicine. Antibiotics tend to be over-prescribed but may also be needed depending on the pathogenicity.

Do you always need a crown after root canal?

In these cases, you may need the strength crowns provide. Premolars and molars that are at low risk of fracture may also be suitable for filling-only restorations after root canals. Front teeth may not need a crown for strength, but you might still refer the improved appearance a crown offers.

Do u need a crown after root canal?

In these cases, you may need the strength crowns provide. Premolars and molars that are at low risk of fracture may also be suitable for filling-only restorations after root canals. Front teeth may not need a crown for strength, but you might still refer the improved appearance a crown offers.

Can you be put to sleep for a root canal?

There are two types of sedation to help people feel at ease during their root canal procedure. During conscious sedation, the patient remains awake. During unconscious sedation, the patient is put to sleep. The patient will fall asleep if a heavier dose of anesthesia is administered for the root canal procedure.

Should I get a root canal or extraction?

Between a root canal and a tooth extraction, a root canal is often the preferred choice because it works on fixing your natural tooth so that it could remain in place. If a tooth is far too compromised, your dentist might recommend an extraction, followed by a dental implant to replace what was lost.

Is it better to get a root canal or extraction?

Between a root canal and a tooth extraction, a root canal is often the preferred choice because it works on fixing your natural tooth so that it could remain in place. However, a root canal may not always be an option, depending upon the damage that a tooth has incurred.

How long does sod take to root?

The answer is that the process takes about two weeks for shallow roots and up to six weeks to establish deep root growth. With proper preparation and care your sod will look beautiful and healthy from the start.

Are you put to sleep for a root canal?

There are two types of sedation to help people feel at ease during their root canal procedure. During conscious sedation, the patient remains awake. During unconscious sedation, the patient is put to sleep. The patient will fall asleep if a heavier dose of anesthesia is administered for the root canal procedure.

What are the signs that a root canal is needed?

Signs you may need root canal therapy include: Severe toothache pain upon chewing or application of pressure. Prolonged sensitivity (pain) to hot or cold temperatures (after the heat or cold has been removed) Discoloration (darkening) of the tooth.

What happens if you leave a root canal untreated?

People have died as a result of complications from an untreated tooth infection. If you don't get Root Canal Treatment then it can lead to much more severe consequences that can be life threatening. The infection in the root of the tooth can spread to the jaw bone and then into the surrounding tissue.

Is a root canal or extraction more painful?

Most people associate having a root canal with a lot of pain and discomfort. However, while most people can expect some discomfort during and after a root canal procedure, excessive pain is not normal. A root canal will treat the diseased tissue (pulp) while preserving the rest of the tooth.

What is cheaper a root canal or extraction?

Total costs for the procedure, including restoration, ranges from $1500 to $2000, once again depending on the tooth. The costs to have a tooth extracted vary from $125 to $350—depending on the tooth. As described, the tooth extraction is much less expensive than doing a root canal.

What happens if you don't get a root canal?

An infected tooth remains infected until the tooth has a root canal or is removed. If it is not treated the infection can spread. If you don't get Root Canal Treatment then it can lead to much more severe consequences that can be life threatening.

Can I brush my teeth after a root canal?

You should brush and floss normally after a root canal unless your dentist specifically gives you differing care instructions.

How long does a bee sting last?

Severe pain or burning at the site lasts 1 to 2 hours. Normal swelling from venom can increase for 48 hours after the sting. The redness can last 3 days. The swelling can last 7 days.

How long does a Yorkie's period last?

An unspayed female Yorkie can usually experience heat around every six to eight months. The heat cycle can last from two weeks to one month. Each phase may be not the same from the last cycle they had. For instance, your Yorkie's first heat can last for two weeks, and her next heat can last for four weeks.

How long does a hernia repair last?

The incision tends to be painful and recovery can take as long as five to six weeks. The incision also leaves a scar, although it's usually very low on the abdomen. Tension repair has a higher recurrence rate than non-tension, or mesh, repair.

How long does a microchip last?

It is designed with an operating life of over 20 years and is guaranteed for the life of the animal. Once injected, the microchip is anchored in place as a thin layer of connective tissue forms around it. The chip requires no care.

How long does a dog UTI last?

The treatment will last between 10 to 14 days and is usually administered orally. There are also injectable options available. In the case of a complicated UTI, antimicrobial therapy will be prescribed for 4 to 6 weeks, with a urine culture advised after one week of treatment in order to test for efficacy.

How long does a dog seizure last?

If a seizure lasts more than three to five minutes, this is an emergency and you should bring your dog to a veterinarian. Their body temperature can rise quickly and can be a problem. Especially as pets age, seizures that last that long can cause problems with their brain and cause brain damage.

How long does a dog season last?

Heat usually lasts between 2-4 weeks. Early in the cycle, a female dog may not be receptive to male dogs, although some are receptive through the entire cycle. It can be shorter or longer and you'll know the cycle is over when all her vulva returns to its normal size and there's no more bleeding or discharge.

How long does a cold last for?

Cold symptoms usually start 2 or 3 days after a person has been exposed to the virus. People with colds are most contagious for the first 3 or 4 days after the symptoms begin and can be contagious for up to 3 weeks. Although some colds can linger for as long as 2 weeks, most clear up within a week.

How long does a puppy sprain last?

Symptoms of anything more than a mild sprain should be addressed by a veterinarian as soon as possible, and even mild limping should be treated if it lasts more than 48 hours.

How long does fostering a dog last?

“Fostering can last anywhere from one day to several months. It really depends on the organization and the dog,” Feldman says. “We ask for as long as possible, but in general, a minimum for us would be two weeks.”

How long does a cyst last?

These 2 types of cysts are the most common and often go away in 1 to 3 months without treatment. They don't usually happen after menopause. You have a higher risk for an ovarian cyst if: You have pelvic inflammatory disease, which is an infection of the female reproductive organs.

How long does a brain shunt last?

It can last from a few days or weeks to many years. In adults we have seen them last for as long as 35 years. Over time the plastic tube can corrode and disintegrate, requiring a new shunt to be inserted. The valve itself can also block and so can the tube that is in the ventricle of the brain itself.

How long does a health certificate last?

The USDA considers a health certificate valid for 30 days; however, many airlines require the certificate to be issued within 10 days of travel. Please contact your airline for specifics on their requirements for pet travel.

How long does a hydrotherapy session last?

Your appointment will be arranged by our hydrotherapy team and each session lasts for approximately 30 minutes. It is a group setting however it is not a class and your programme will be individually tailored towards your condition.

How long does a respiratory infection last?

The symptoms of upper respiratory infection usually last between 3-14 days; if symptoms last longer than 14 days, an alternative diagnosis can be considered such as, sinusitis, allergy, pneumonia, or bronchitis.

How long does a blood transfusion last?

Fast facts on the effects of blood transfusions: In many cases, a person will feel positive effects of a blood transfusion immediately. A blood transfusion typically takes 1-4 hours, depending on the reason for the procedure. The benefits of a transfusion may last for up to 2 weeks but vary depending on circumstances.

How long does a dog chip last?

It is designed with an operating life of over 20 years and is guaranteed for the life of the animal. Once injected, the microchip is anchored in place as a thin layer of connective tissue forms around it. The chip requires no care. It does not pass through or out of the body.

How long does a tick bite last?

- Only 2% of tick bites result in Lyme disease. - Tick bite reactions are small, less than 1-2” in size. - Surrounding redness does not expand when observed over 24-48 hrs. - Reaction at site of tick bite can last days, even weeks.

How long does Hep A vaccine last?

Yes, It is not known for how long protection from one hepatitis A vaccine dose lasts, but it has been shown to last for at least 10 years (33). One dose of single-antigen hepatitis A vaccine administered at any time before International travel can provide adequate protection for most healthy persons.

How long does a dog's scent last?

In truth they are all right and they are all wrong because viable scent is different from dog to dog. Some dogs will be able to detect and follow scent months after the original trail was laid while other dogs may not be able to detect the scent trail after 24 hours.

How long does a baby congestion last?

Most symptoms last for 2 to 4 days, but the runny and stuffy nose can last up to 3 weeks. The cough can last for up to 2 months. If your child has trouble breathing and swallowing, call your child's doctor right away.

How long does a runny nose last?

Cold symptoms typically last for about 3 days. At that point the worst is over, but you may feel congested for a week or more.

How long does a bully stick last?

Bully Sticks can last for up to two years or more from when they are produced and are known to be a very hardy product. Our bully stick stock rotates extremely quickly, and we ensure that every stick we ship will have at least a 1.5 year remaining shelf life upon receipt.

How long does a fart last?

Though farts come out with varying velocities, we don't typically smell them for about 10-15 seconds after letting them rip. This is because it takes that long for the odor to reach your nostrils.

How long does a dog sedative last?

The drug's effect typically lasts six to eight hours but may be prolonged in certain cases. Give acepromazine 30 to 60 minutes before you need your pet to be sedated.

How long does a dog teething last?

Adult dogs have 42 permanent teeth, and all of the teeth are usually in by the time the pup is eight months old. The good news is this is usually the point when teething stops. The bad news is that if you haven't been working with your pup, he or she may continue to chew on things just for the fun of it.

How long does a stomach bug last?

Depending on the cause, viral gastroenteritis symptoms may appear within one to three days after you're infected and can range from mild to severe. Symptoms usually last just a day or two, but occasionally they may persist as long as 10 days.