Why Does My Tooth Hurt When I Bite Down?
Pain when biting down means something is putting pressure on a tooth structure or nerve that is already irritated. Healthy teeth handle biting forces without pain. When a tooth hurts under pressure, it usually means there is damage, inflammation, or infection somewhere in or around the tooth.
The location and type of pain can give clues about the cause. A sharp, quick pain often points to a crack or a high restoration. A dull, lingering ache may suggest pulp inflammation or an abscess forming at the root tip. Pain that comes and goes can be harder to diagnose, which is why specialists like endodontists use advanced tools to find the source.
Common Causes of Tooth Pain When Biting Down
Several conditions can cause pain when you bite or chew. Some are straightforward to treat, while others need specialist care. Here are the most common causes.
Cracked Tooth
A cracked tooth is one of the most frequent causes of sharp biting pain. The crack may be too small to see with the naked eye or even on a standard X-ray. When you bite down, the crack flexes open slightly and irritates the nerve inside the tooth. Releasing the bite lets the crack snap back, which can cause a second jolt of pain.
Cracked teeth are more common in molars, teeth with large fillings, and people who clench or grind their teeth. An endodontist can use a dental microscope and CBCT (3D) imaging to find cracks that other providers might miss.
High Filling or Crown
If biting pain started shortly after a dental procedure, the filling or crown may be sitting too high. This means it contacts the opposing tooth before the rest of your bite comes together, concentrating force on that one spot. The fix is usually a simple adjustment where the dentist smooths down the high point. The pain typically resolves within a few days after the adjustment.
Pulp Inflammation (Pulpitis)
The dental pulp is the soft tissue inside the tooth that contains nerves and blood vessels. When it becomes inflamed, a condition called pulpitis, the tooth may hurt when you bite, chew, or even touch it with your tongue. Pulpitis can result from deep decay, repeated dental procedures on the same tooth, or trauma.
Reversible pulpitis means the inflammation is mild and the tooth can heal if the irritant is removed. Irreversible pulpitis means the nerve damage is too far along, and the tooth will likely need root canal treatment from an endodontist.
Dental Abscess
An abscess is a pocket of infection, usually at the tip of the tooth root. It forms when bacteria from a dead or dying nerve spread into the surrounding bone. An abscessed tooth often throbs on its own and gets worse when you bite down. You may also notice swelling, a bad taste in your mouth, or a small bump on the gum near the tooth.
A dental abscess requires professional treatment. Antibiotics alone will not cure it. An endodontist can perform root canal treatment to remove the infection and save the tooth, or refer you for extraction if the tooth cannot be restored.
Periodontal (Gum) Problems
Sometimes the pain is not coming from inside the tooth but from the structures around it. A periodontal abscess, which forms in the gum tissue or bone next to the tooth, can cause pain when biting. Advanced gum disease can also make teeth feel sore or loose under pressure. If the cause is periodontal rather than endodontic, a periodontist is the appropriate specialist to see. Learn more about gum-related symptoms on our [periodontics specialty page](/specialties/periodontics).
Home Care for Tooth Pain When Biting
Home care can help manage pain while you wait for a dental appointment, but it does not replace professional diagnosis and treatment. These steps can reduce discomfort in the short term.
- Avoid chewing on the painful side. Stick to soft foods until you can see a dentist.
- Over-the-counter pain relievers such as ibuprofen (Advil, Motrin) can reduce both pain and inflammation. Follow the dosage on the label.
- A cold compress on the outside of your cheek, 15 minutes on and 15 minutes off, can help with swelling and numb the area.
- Avoid very hot, very cold, or very sugary foods and drinks, which may trigger additional pain.
- Do not try to adjust or file down a filling on your own. This requires a dentist.
When Home Care Is Not Enough
Home care is a temporary measure. If your tooth pain when biting down lasts longer than one to two days, gets worse instead of better, or is accompanied by swelling, fever, or pus, you need professional care. Delaying treatment for an infection can allow it to spread to nearby tissues or even into the bloodstream in rare cases.
How Dentists and Endodontists Diagnose Biting Pain
Diagnosing the cause of biting pain can be tricky because multiple conditions produce similar symptoms. Your dentist or endodontist will use a combination of tests to narrow down the source.
Bite Test and Percussion
The dentist may ask you to bite on a cotton roll, a wooden stick, or a special device called a Tooth Slooth. This isolates individual cusps of the tooth to identify exactly where the pain is coming from. Tapping on the tooth (percussion testing) checks for tenderness in the root and surrounding bone.
X-Rays and CBCT Imaging
Standard dental X-rays can reveal large cavities, abscesses, and bone loss. However, cracks and early infections often do not show on flat X-rays. Cone-beam computed tomography (CBCT) provides a 3D view of the tooth and bone, making it much easier to spot fractures, hidden infections, and complex root anatomy. Endodontists commonly have CBCT scanners in their offices.
Pulp Vitality Testing
Cold testing and electric pulp testing check whether the nerve inside the tooth is alive, inflamed, or dead. A tooth that does not respond at all may have a dead nerve and a developing infection. A tooth that responds with intense, lingering pain may have irreversible pulpitis. These tests help the endodontist decide whether root canal treatment is needed.
When to See a Dentist vs. an Endodontist
Start with your general dentist for biting pain. They can check for obvious issues like a high filling, visible decay, or gum disease. If the cause is clear and straightforward, your dentist can often handle it.
See an Endodontist When
- Your dentist suspects a cracked tooth but cannot confirm it with standard X-rays
- You have been told you need a root canal, especially on a molar or a tooth with prior dental work
- The pain persists after your dentist has already adjusted a filling or crown
- There are signs of infection such as swelling, a draining sore on the gum, or a persistent bad taste
- You have had a root canal on the tooth before and the pain has returned (retreatment case)
- Your dentist is unsure of the diagnosis and recommends a specialist evaluation
Your General Dentist Can Handle
- A filling or crown that needs to be adjusted for your bite
- A new cavity causing sensitivity
- Mild gum inflammation around a single tooth
- A straightforward root canal on a front tooth or premolar with simple anatomy
Find an Endodontist Near You
If you have tooth pain when biting down that your general dentist cannot resolve, an endodontist can help. Every endodontist listed on My Specialty Dentist has verified specialty credentials. Search by your location to find a root canal specialist near you.
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