Managing Tooth Fracture and Pain: Reading What the Symptoms Mean

Fractured teeth are frustrating to diagnose because the fracture itself is frequently invisible. A crack running through dentine does not show on a radiograph, which images in two dimensions and cannot resolve a gap of a few microns. It may not be visible to the eye either.

What is available instead is the pain, and it turns out to be a reasonably reliable guide. Different fracture types load the tooth differently and involve different tissues, and each produces a characteristic pattern. This article works through those patterns and what each one points towards.

For the treatment side in more general terms, our article on how fractured teeth are repaired covers the restorative options.

This distinction does more diagnostic work than any other.

Pain on release — you bite on something, feel nothing much, and then get a sharp jolt as you let go — is close to diagnostic of a crack propagating through dentine. The mechanism is mechanical. Biting down flexes the two segments of the tooth apart slightly; releasing allows them to snap back together, and the sudden movement of fluid within the dentinal tubules stimulates the nerve endings at the pulp. This is the signature of cracked tooth syndrome, and it is often the only symptom for months.

It is typically: - Intermittent and unpredictable — present with one bite, absent with the next. - Provoked only by certain foods or certain angles of chewing, because only some directions of load open the crack. - Difficult to localise. Patients often cannot say which tooth, or even reliably which jaw. - Frequently accompanied by sensitivity to cold.

The unpredictability is why it often goes unreported for a long time, and why patients sometimes worry they are imagining it. They are not — it is characteristic.

Pain on biting down, by contrast, suggests something different: a tooth that is tender in its socket. That points towards inflammation of the periodontal ligament, which can be caused by a fracture extending towards the root, by an infection at the root tip, or simply by a restoration that is too high. Our article on bite alignment in restorations covers the last of those.

Pain on biting that is constant and localised, with a dull background ache, suggests the process has moved beyond a simple crack — commonly a pulp that has become irreversibly inflamed or an infection developing.

Our article on cracked tooth syndrome covers that specific presentation in more detail.

Cold is the second most informative test, and the key variable is duration.

Sharp pain that stops within a second or two of removing the cold. The pulp is inflamed but probably recoverable. Dentine is exposed — through a fracture, a lost restoration, or wear — and the fluid movement in the tubules is stimulating the nerve. Restoring the tooth is usually sufficient.

Pain that lingers for thirty seconds or more after the cold is removed. This is a substantially different finding. It suggests irreversible pulpitis — the pulp is inflamed beyond the point of recovery, and root canal treatment is likely to be needed rather than a restoration alone. Our article on that threshold explains why it matters.

Sensitivity to heat rather than cold. Generally a later and more concerning sign, often associated with a pulp that is necrotic or becoming so. Worth prompt assessment.

Relief from cold. Occasionally patients hold cold water against a tooth for relief. This is a recognised sign of an advanced pulpal problem and should not be interpreted as reassuring.

Why cold water hurts a broken tooth covers the mechanism.

Pain that arrives without any stimulus — particularly pain that wakes you, or that worsens when you lie down — indicates the pulp is involved rather than just the dentine. Lying flat increases blood pressure in the head, and a pulp confined within rigid dentine has nowhere to expand, so pressure rises.

Throbbing pain, pain requiring regular analgesics, or pain radiating to the ear, temple or jaw all point the same way. This is not a wait-and-see situation. Severe toothache at night covers management in the interim.

Broadly, five patterns.

Craze lines. Superficial cracks in enamel only. Extremely common, particularly in older teeth. Symptomless, and generally require nothing beyond monitoring unless they are an aesthetic concern. Our article on enamel crazing and minimally invasive resin covers the cosmetic options.

Fractured cusp. A piece of the tooth, usually around a large filling, shears off. Frequently produces little discomfort if the pulp is not involved, because the flexing stops once the loose portion detaches. Typically restored with an onlay or crown.

Cracked tooth. A crack running from the biting surface towards the root, still in one piece. This is the classic pain-on-release presentation. Treatment depends on how far it extends: a crown or onlay to hold the segments together if the crack is confined to the crown; root canal treatment first if the pulp is involved; extraction if it extends below the bone. The difficulty is that the extent often cannot be determined without removing the existing restoration and looking.

Split tooth. The crack has progressed completely through, and the segments are separable. Usually the end point of an untreated cracked tooth. Sometimes one segment can be removed and the rest restored; often the tooth cannot be saved.

Vertical root fracture. Starts at the root and travels upwards, most often in root-treated teeth. Symptoms are frequently vague — a persistent dull discomfort, a gumboil, a narrow deep pocket beside the tooth on probing. Usually the tooth cannot be retained.

Large existing restorations. The most common factor. A filling occupying much of the biting surface leaves thin unsupported walls that flex under load. Whether a large filling can break a tooth covers this, and whether a crown can prevent it covers the preventive option.

Root-treated teeth. These have lost structure to access the canals and are commonly restored after extensive decay. They are also less likely to give early warning, because the pulp — and therefore the sensation — is gone.

Grinding and clenching. Sustained lateral forces well beyond chewing loads. See whether grinding can crack teeth.

A sudden load. Biting an olive stone, a popcorn kernel, an unexpected bone. Frequently the trigger rather than the cause, in a tooth already weakened.

Trauma, including sporting impacts.

Thermal cycling over years — the repeated expansion and contraction of tooth and filling material at different rates.

• Chew on the other side entirely. Continuing to load a cracked tooth propagates the crack, and how far it propagates determines whether the tooth is restorable.

• Avoid temperature extremes and very hard or sticky food.

• Take over-the-counter analgesics according to the packet instructions, if suitable for you.

• Rinse with warm salt water if the gum is involved.

• Cover a sharp edge with orthodontic wax or sugar-free gum if it is cutting the tongue or cheek.

• Do not apply aspirin to the gum. It causes a chemical burn and does not help the tooth.

• Do not delay because the pain has stopped. Pain ceasing after a period of severe toothache can mean the pulp has died rather than recovered, and infection generally follows.

Temporary toothache relief before an appointment covers interim measures.

Seek urgent care for facial or gum swelling; fever or feeling generally unwell with dental pain; difficulty swallowing or breathing, or swelling spreading towards the eye or under the jaw, which require immediate medical attention; severe pain not controlled by ordinary analgesics; a visibly mobile tooth segment; or a fracture with visible pink or bleeding pulp.

Our article on what constitutes a true emergency sets out the distinction.

Why can my dentist not see the crack on an X-ray?

Radiographs image in two dimensions, and a crack that runs in the plane of the beam presents no density difference to detect. Diagnosis relies on symptom pattern, bite testing on individual cusps, transillumination, dyes and sometimes removing the existing restoration to look directly.

Why does it hurt when I let go rather than when I bite?

Because the segments of a cracked tooth flex apart under load and snap back on release, and that sudden movement stimulates the nerve. It is characteristic of a crack propagating through dentine.

My cracked tooth stopped hurting. Is it healed?

Teeth do not heal cracks. Pain stopping may mean the loose portion has detached, or that the pulp has died. Neither is a reason to leave it.

Will I definitely need a crown?

Not always. A fractured cusp may be restorable with an onlay; a crack extending further usually needs full coverage to hold the tooth together. The extent determines the answer.

How long can I leave a cracked tooth?

Continuing to chew on it propagates the crack, and each millimetre it travels towards the root reduces the chance of saving the tooth. This is one of the situations where prompt attention materially changes the outcome.

Can a cracked tooth be saved?

Frequently, if the crack is confined to the crown of the tooth. Cracks extending below the bone level are generally not restorable, which is why early assessment matters.

If you have intermittent pain on releasing a bite, or cold sensitivity that lingers, it is worth having the tooth assessed before it becomes clearer — a crack is considerably easier to manage before it reaches the root.

You can contact our team at our Wimpole Street practice, or see our emergency dentist page for urgent care.

This article provides general information about tooth fractures and does not constitute individual dental advice. The type and extent of a fracture, and whether a tooth can be saved, can only be determined by clinical examination and appropriate investigations. If you develop facial swelling, fever, or difficulty swallowing or breathing, seek urgent medical attention. Wimpole Dental is regulated by the Care Quality Commission, and our clinicians are registered with the General Dental Council.

Next review due: 12 August 2027