Short answer: Pain after root canal treatment and tenderness when you bite down on the tooth occur in most patients because of the inflammatory response of the tissues at the root tip to the treatment, and they usually ease within a few days. If the tenderness lasts longer than a week, keeps getting worse or comes with swelling and fever, you should see your dentist to check for causes such as a high filling, remaining infection or a crack in the tooth.
Root canal treatment aims to keep a tooth in the mouth by cleaning out an inflamed or infected tooth nerve. After treatment is complete, many patients describe mild pain when biting down on the tooth or a feeling that the tooth is "taller" than the others. In most cases, pain after a root canal is a natural part of the healing process; in some cases, however, it may be a sign of a problem that needs your dentist's attention. In this article we have brought together information to help you tell what is normal from what is not.
Is tenderness after a root canal normal?
Yes, in most patients it is normal to feel tenderness when biting down or chewing on the tooth in the first days after root canal treatment. The main reason is that the tissues surrounding the root tip are stimulated during treatment and respond with mild inflammation.
In root canal treatment, the nerve tissue is cleaned out from inside the tooth; however, at the tip of the root, the connective tissue that attaches the tooth to the bone is alive. This tissue is somewhat stimulated while the root canals are shaped, rinsed and filled. Especially if there was inflammation or an abscess at the root tip before treatment, this area is already sensitive and may take a little longer to heal. This is why the tooth can feel taller than the others and uncomfortable when you bite.
Symptoms that can be considered normal include:
- Mild to moderate tenderness when biting and chewing
- A slight feeling of fullness or of the tooth being taller
- A slight ache in the gum and jaw after the anesthesia wears off
- Jaw fatigue from keeping the mouth open for a long time
Because its nerve has been removed, a tooth that has had a root canal usually does not react to hot and cold. If sensitivity to hot and cold continues, it needs to be determined whether it is coming from the same tooth or from a neighboring tooth.
How long does tenderness last after a root canal?
In most patients, tenderness after a root canal is most noticeable in the first 24-72 hours and usually eases markedly within a few days to a week. Mild chewing tenderness may be felt now and then for several weeks, especially in teeth that had inflammation at the root tip before treatment.
What matters is how the pain evolves. Tenderness that decreases day by day is a sign of healing. In contrast, pain that keeps increasing, becomes more severe after a few days or does not ease at all after more than a week needs to be assessed.
What you can do during the healing period:
- Avoid biting hard foods with the treated tooth for a few days.
- If you have a temporary filling, do not chew sticky foods on that side until the permanent filling or crown is placed.
- Continue brushing and flossing gently.
- If you need a pain reliever, take the one your dentist recommends as directed; do not change the dose or medication on your own.
Do not delay the permanent restoration
Root canal treatment is complete only when the top of the tooth is sealed with a permanent filling or crown. As the name suggests, temporary fillings are designed for short-term use and can wear down or leak within weeks. Leakage can allow bacteria in the mouth to reach the cleaned canals again and reduce the success of the treatment. That is why coming to your permanent restoration appointment at the time your dentist recommends helps both the tenderness to settle and the tooth to be protected for a long time. Especially in molars, a crown distributes chewing forces and reduces the risk of the tooth fracturing.
What are a high filling and other causes?
If difficulty biting after a root canal lasts a long time, one of the most common causes is a filling that has been left too high; apart from this, infection remaining in the canal, a crack in the tooth and problems in the neighboring tissues can also cause similar complaints.
High filling
If the temporary or permanent filling placed at the end of root canal treatment touches the opposing tooth before the other teeth do, extra force is placed on the tooth with every bite. The already sensitive tissues at the root tip cannot heal because of this repeated loading. While the anesthesia is still in effect, the patient may not notice this. If you feel that tooth "hits first" when you close your mouth, tell your dentist. Removing the high spot is usually a simple procedure lasting a few minutes and often brings noticeable relief.
Remaining or recurring infection
Root canals are quite complex structures. Sometimes hard-to-detect extra canals, curved roots or bacteria remaining in the canal can delay healing. Leakage of the temporary filling can also cause the canal to become contaminated again.
A crack in the tooth
Especially in molars with large fillings or root canal treatment, cracks that cannot be seen with the naked eye can cause sharp pain when biting. Because teeth that have had a root canal can become more brittle over time, a crown is often recommended for back teeth.
Other causes
- Slight extrusion of the root canal filling material beyond the root tip
- A clenching or grinding habit
- A separate problem in the gum or neighboring teeth
- A feeling of pressure in the upper back teeth due to sinusitis
When should you see a dentist?
If any of the following occur after root canal treatment, you should see your dentist without waiting:
- Pain that increases instead of decreasing after a few days, or lasts longer than a week
- Swelling of the face, cheek or gum
- Fever, fatigue or a bad taste in the mouth
- A pimple-like bump on the gum that drains pus
- The temporary filling falling out or breaking
- The tooth touching before the others when you close your mouth
- Allergic symptoms to the medications used, such as itching, a rash or shortness of breath
Rapidly spreading swelling that makes it hard to breathe or swallow is an emergency; in that case, go to a hospital emergency department.
What are the solutions?
Treatment of prolonged pain after a root canal is determined by its cause. At the examination, the tooth's bite is checked, tapping and biting tests are done and, if necessary, an X-ray is taken. Depending on the findings, one of the following approaches may be taken:
- Bite adjustment: If there is a high filling, the filling is reduced to balance the biting force.
- Monitoring: If the findings are consistent with the healing process, it may be recommended to monitor the tooth for a while longer.
- Root canal retreatment: If remaining infection or a missed canal is suspected, the old filling is removed and the canals are cleaned and filled again.
- Root-end surgery: In some cases where retreatment is not sufficient or cannot be done, the inflamed tissue at the root tip can be removed surgically.
- Crown: The permanent restoration is completed to prevent the tooth from fracturing and to protect the canal from the outside environment.
- Extraction: In situations that cannot be saved, such as a vertical root fracture, it comes up as the last option.
For other frequently asked questions about root canal treatment, take a look at our frequently asked questions page.
When should you seek care in Ankara if pain after a root canal does not go away?
If your tenderness lasts longer than a week, if you feel a sharp pain when biting or if swelling has started, it is a good idea to see the dentist who did the treatment or another dentist for a check-up. At our polyclinic in Park Oran Ofis on Kudüs Caddesi in Çankaya, we look for the cause by assessing your tooth's bite and the condition of the root tip, and we plan a suitable solution together with you. Appointment details are on our contact page.
Frequently asked questions
How many days does it hurt to bite on a tooth after a root canal?
In most patients, tenderness is noticeable in the first 2-3 days and largely subsides within a week. Mild chewing tenderness may last a few weeks; however, pain that increases or does not go away requires a check-up by your dentist.
Is swelling normal after root canal treatment?
Mild tenderness can be normal; however, noticeable swelling of the face or gum, or swelling accompanied by fever, is not normal. With these symptoms, you should see a dentist without delay.
Can a high filling cause pain?
Yes. A filling that touches the opposing tooth too early places extra force on the tooth with every bite and can delay healing at the root tip. Reducing the filling often brings noticeable relief.
Can root canal treatment be redone?
Yes, root canal treatment can be redone in situations such as remaining infection or a missed canal. The old filling is removed and the canals are cleaned and filled again; suitability is determined by an examination and X-rays.
