Quick answer: Tooth pain when biting can come from decay, a loose filling, a crack or a problem inside the tooth. The symptom alone cannot tell you which treatment you need. Arrange a dental assessment, especially if pain keeps returning, follows treatment or comes with swelling. A brief sharp pain when you release a bite can be a clue to a crack, but it is not a diagnosis.
A tooth may feel comfortable until you bite into lunch, then give a sudden jolt. Sometimes the pain is hard to locate; sometimes one filled or crowned tooth is clearly involved. This guide explains useful clues, what to do while arranging advice and how a dentist decides whether a repair, root canal treatment or another approach is appropriate.
When should you get help?
Contact a dentist about new or recurring pain on biting. Do not wait for a visible break: some cracks are difficult to see. Explain whether you can eat normally and whether there is swelling, fever or a bad taste.
| What is happening? | What to do |
|---|---|
| Pain when chewing, a changed bite or a suspected crack | Arrange a dental assessment. Tell the practice if the tooth was recently treated or injured. |
| Severe pain, facial or gum swelling, fever, or a suspected abscess | Seek urgent dental advice. Contact your dentist; if you cannot obtain urgent care, use NHS 111. |
| Difficulty breathing, swallowing or speaking; swelling around an eye or the neck; or extensive mouth swelling | Get emergency medical help: call 999 or go to A&E. Do not drive yourself. |
These distinctions follow NHS toothache advice and NHS dental abscess guidance. An abscess needs dental treatment and will not resolve on its own.
Why might a tooth hurt when you bite?
A crack or a fractured part of the tooth
Cracked teeth can cause intermittent chewing pain, sometimes as the pressure is released, as well as sensitivity to temperature. Pain may come and go or be difficult to pinpoint. According to the American Association of Endodontists, movement of cracked tooth tissue during chewing can irritate the pulp inside. A painless surface line and a deeper crack are different problems; a dentist needs to assess the tooth.
Decay, a loose filling or inflamed pulp
Sharp biting pain may also be associated with decay, a loose filling or damage to the soft tissue inside a tooth. A lingering response to heat or cold is another detail to report. These symptoms can overlap, so choosing a root canal or extraction from symptoms alone is unreliable. The AAE tooth pain guide describes why examination matters.
Grinding, clenching or a damaged restoration
Grinding can wear or break teeth and fillings and may come with jaw pain or headaches. Mention morning jaw discomfort or a partner noticing grinding during sleep. A dentist may recommend a fitted guard or splint where appropriate; it is not a substitute for investigating one painful tooth. See NHS guidance on teeth grinding.
Pain when biting after a filling, crown or root canal
After a filling: some temporary sensitivity can occur. However, pain when closing your teeth together may mean the filling is interfering with your bite. Contact the treating dentist if the tooth feels as though it meets first or chewing remains uncomfortable. The dentist can check and, if needed, reshape the filling. Do not try to file it yourself. Cleveland Clinic explains this distinction.
Under an existing crown: pain needs assessment even if the crown looks intact. Tell the practice about looseness or any change in your bite. If the restoration has come off, follow our separate guide to a lost filling or crown.
After root canal treatment: follow the instructions from your treating dentist. Our root canal aftercare guide covers recovery and symptoms that need further advice. Tell the practice about worsening pain, swelling or a lost temporary restoration rather than assuming every symptom is routine healing.
How does a dentist find the cause?
The examination may include checking restorations and gums, assessing how your teeth meet, testing the tooth and using a light to investigate a suspected crack. Dental X-rays may be recommended when clinically justified. Referral can be appropriate when further investigation or treatment is needed. Cleveland Clinic describes the assessment of fractured teeth.
A normal-looking X-ray does not exclude every crack. The Oral Health Foundation explains that cracks often do not appear on standard X-rays. A panoramic image is therefore not an automatic answer to pain in one tooth: the dentist chooses the examination and imaging needed for the clinical question. Our OPG guide explains the limits of a broad panoramic view.
What can you do while waiting?
- Choose soft food and avoid chewing on the painful tooth.
- Avoid very hot, cold or sweet food and drink if they trigger pain.
- Clean gently with a soft toothbrush.
- Ask a pharmacist about suitable pain relief and follow the packet instructions.
- Do not put aspirin directly on the tooth or gum.
These measures may ease discomfort; they do not repair a crack or treat the cause of infection. When contacting the practice, have a short account ready: when the pain started, which tooth seems involved, whether it occurs on biting or release, any recent treatment and whether symptoms are worsening. Mention medicines taken for the pain and any relevant medical conditions.
Will you need a filling, crown or root canal?
The answer depends on the diagnosis and how much sound tooth remains. A repair may be suitable for some damage; a crown may protect a weakened tooth. If the pulp is affected, root canal treatment may be considered. Some deep fractures cannot be restored. A crack cannot heal itself like a broken bone, and no treatment guarantees that a damaged tooth can be retained.
Read our crown versus onlay comparison and root canal versus extraction guide after assessment to understand the options discussed.
Abi Dental Care’s published fee guide lists an emergency appointment at £100 plus the treatment fee. This is not an all-inclusive repair price. Ask for a written estimate identifying any examination, imaging, temporary repair and final treatment charges. Fees checked on 24 October 2026; confirm the current total with the practice.
Common questions
Does pain on biting always mean a cracked tooth?
No. Decay, loose fillings and pulp problems can produce similar symptoms. A crack is one possibility, not a conclusion.
Can a cracked tooth get better by itself?
The crack itself does not heal. Symptoms can fluctuate, so a pain-free interval does not establish that the tooth is sound. Arrange a dental assessment.
Does every painful tooth need root canal treatment?
No. The cause, condition of the pulp and restorability of the tooth determine the options. Pain alone cannot establish which treatment is appropriate.
Arrange advice in Maida Vale
Call Abi Dental Care on 020 7286 2626 and describe your symptoms so the team can advise about availability. For urgent symptoms, see our emergency dental care page. For a non-urgent assessment, request an appointment at 7 Clarendon Terrace, London W9 1BZ.
General patient information, not an individual diagnosis. External sources checked on 24 October 2026. This records an editorial source check, not a clinical review of this article.
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