Common Causes of Pain When Biting Down
Every time you chew, your teeth absorb concentrated force — up to 70 kg of pressure on your back molars alone. Healthy teeth handle this without any discomfort. But when something is structurally wrong or infection is present, that same biting force triggers pain. Here are the most common reasons.
Cracked or Fractured Tooth
Hairline cracks can develop from grinding or clenching (bruxism), chewing on ice, biting hard foods, or even from old, large fillings that weaken the remaining tooth structure over time. The pain is often sharp and fleeting — it hurts the moment you bite down but stops as soon as you release the pressure. This on-off pattern is a hallmark of a cracked tooth.
Cracks can be difficult to detect. They may not show up on a standard X-ray, so your dentist may use a special dye, transillumination (shining a bright light through the tooth), or a bite test to locate the fracture. If the crack is deep or extensive, treatment may involve a crown to hold the tooth together, or a root canal if the crack has reached the nerve.
High Filling or Crown
If you have recently had a new filling or crown placed, your bite may be slightly “high” — meaning the restored tooth sits a fraction too tall compared to the teeth around it. This causes that tooth to absorb more force than it should every time you close your mouth or chew.
The good news is that this is a straightforward fix. Your dentist can adjust the bite in just a few minutes by gently reshaping the filling or crown surface. If biting pain starts shortly after dental work, let your dentist know — it is likely a simple adjustment.
Tooth Decay or Cavity
A deep cavity weakens the internal structure of a tooth. When you bite down, the remaining weakened tooth flexes under pressure, irritating the nerve inside and causing pain. In early stages, the discomfort may be mild and intermittent, but it tends to worsen as the decay progresses. Addressing cavities early with a filling prevents the need for more involved treatment later. Learn more in our guide on how to prevent cavities and tooth decay.
Dental Abscess or Infection
When bacteria reach the pulp (nerve) of a tooth or the tissues around the root tip, an infection or abscess can form. The build-up of pressure from the infection makes the tooth extremely sensitive to biting force. You may also notice swelling around the gum, a persistent bad taste in your mouth, or a throbbing ache that does not go away.
A dental abscess will not resolve on its own and requires prompt treatment to prevent the infection from spreading. If you are experiencing a toothache with swelling, see a dentist as soon as possible. Read our guide on what to do if your face is swollen from a toothache for urgent advice.
Gum Disease
Advanced gum disease (periodontitis) damages the bone and ligaments that support your teeth. As support is lost, teeth become slightly loose and shift under biting pressure, causing pain or discomfort when you chew. You may also notice bleeding gums or loose teeth. If you are unsure whether your symptoms point to gum disease, review the common signs of gum disease.
Wisdom Tooth Issues
Partially erupted or impacted wisdom teeth can cause pain when you bite, especially if the opposing tooth presses against a swollen gum flap or if decay has developed on the wisdom tooth itself. Because wisdom teeth sit at the back of the mouth where cleaning is difficult, they are prone to problems. If your biting pain is concentrated in the very back of your jaw, your wisdom teeth may be the cause. Learn more about wisdom tooth surgery options.
What to Do If It Hurts to Bite Down
While you wait for your dental appointment, these steps can help manage the discomfort:
- Avoid chewing on the painful side — shift to the other side of your mouth to reduce pressure on the affected tooth
- Stick to softer foods temporarily — soups, yoghurt, scrambled eggs, and well-cooked rice are gentler on tender teeth
- Over-the-counter pain relief — ibuprofen or paracetamol can help manage the pain (follow the dosage instructions on the pack)
- Avoid very hot or cold foods — temperature extremes can aggravate the discomfort if the nerve is already irritated
- Do not ignore it — pain on biting usually signals a problem that will not resolve on its own and tends to get worse over time
The sooner you see a dentist, the more treatment options you will have. Book an appointment at Trust Dental Surgery so we can find out what is causing your pain and recommend the right treatment.
How Your Dentist Diagnoses Biting Pain
Pinpointing the exact cause of biting pain requires a systematic approach. Here is what to expect during your visit:
- Visual examination — your dentist checks for visible cracks, large cavities, swelling, or signs of gum disease
- Bite test — you bite down on a special stick or rubber instrument one tooth at a time to identify exactly which tooth is causing the pain
- X-ray — digital X-rays reveal decay, bone loss around the roots, and signs of abscess that are not visible to the naked eye
- Transillumination — a bright light shone through the tooth can highlight hairline cracks that X-rays miss
- 3D scan for complex cases — when standard X-rays are inconclusive, a 3D scan provides a detailed view of the tooth structure, root anatomy, and surrounding bone
Treatment Options
Treatment depends on what is causing the pain. Here are the common approaches:
- Bite adjustment for high fillings — a quick, painless procedure where the dentist reshapes the filling or crown so your bite is even again
- Fillings for cavities — removing the decay and restoring the tooth with a composite filling
- Crown for cracked teeth — a dental crown covers and protects the tooth, holding it together and preventing the crack from spreading. Read our dental crown guide and crown cost breakdown for more details
- Root canal for infected or deeply cracked teeth — a root canal treatment removes the infected nerve tissue and seals the tooth. For patients aged 60 and above, root canal is claimable under Flexi-MediSave ($200/year)
- Extraction as a last resort — if a tooth cannot be saved, extraction may be necessary. Wisdom tooth surgical extraction costs $350–$1,250 per tooth and is 100% Medisave claimable (up to $1,250 per tooth). If a non-wisdom tooth is extracted, replacement options include dental implants — Osstem or Dentium at $2,449 total ($499 after Medisave), or Straumann at $3,449 total ($1,499 after Medisave). All prices are before GST (9%)
- Gum treatment — gum surgery from $500, Medisave claimable, to address periodontitis that is causing tooth looseness and biting pain
- Scaling and polishing — from $85 before GST for preventive gum care and maintenance after treatment
When Biting Pain Is an Emergency
Most biting pain can wait a few days for a dental appointment. But certain symptoms suggest you should seek care urgently:
- Pain with facial swelling — this may indicate an abscess that is spreading. Read our guide on swollen face from a toothache for what to do right away
- Fever alongside tooth pain — fever combined with dental pain can signal a serious infection that needs prompt treatment
- A tooth that is visibly broken or loose after injury — dental trauma requires same-day assessment to maximise the chance of saving the tooth
- Pain so severe it disrupts sleep — intense night-time pain often indicates nerve involvement or infection. See our article on throbbing tooth pain at night for more guidance
If you are experiencing any of the above, contact Trust Dental Surgery immediately or visit your nearest dental clinic.
