Broken Tooth: How the Type of Fracture Decides What to Do Next

When a tooth breaks, the first instinct is to work out how bad it is. That is the right instinct, and there is a reasonably reliable way to do it that does not require a dentist's chair.

A tooth is built in layers. Enamel on the outside, dentine beneath it, pulp — nerve and blood supply — at the centre, and root anchored in bone. A fracture is classified by which of these layers it has reached, and that single fact determines the urgency, the interim measures that help, and the treatment likely to follow.

Enamel only. A small chip at the corner or biting edge. The surface looks white or slightly translucent where it has broken, the same colour as the rest of the outer surface. There is no sensitivity to cold or air. It may catch your tongue.

Into dentine. The broken surface has a yellower, more opaque appearance than the surrounding enamel, because dentine is naturally darker. Cold air, cold water and sweet things produce a sharp, short jolt. This is the most common category.

Pulp exposed. Somewhere on the broken surface there is a pink or red spot, sometimes with a bead of blood. This is the pulp, and it is now open to the mouth. It hurts, often considerably, and is exquisitely sensitive to air.

Crown-root fracture. The fracture line runs below the gum line. You may see a fragment that is mobile but still attached, and the gum around it may bleed.

Vertical root fracture. A split running down the root, usually in a heavily restored or root-treated tooth. Often no visible break at all. Symptoms are vague — discomfort on biting, a gum swelling or sinus that keeps returning near the middle of the root.

Enamel chip — not urgent. Book a routine appointment. Smoothing the edge or a small addition of composite is usually all that is needed. Our article on whether a slightly chipped tooth needs urgent treatment covers this, and our article on how fast a chipped tooth should be addressed covers the timeframe.

Into dentine — prompt but not an emergency. Exposed dentine tubules run directly towards the pulp, and leaving them open to bacteria and thermal stimulus for an extended period risks pulp inflammation. Days rather than weeks. Our article on why cold water hurts a broken tooth explains the mechanism.

Pulp exposed — same day. The pulp has a limited window during which it may be saved with a direct dressing rather than needing root canal treatment, and that window narrows with contamination time. Our article on an exposed nerve in a broken tooth covers what is done.

Crown-root fracture — same day or next day. Whether the tooth can be restored depends on how far below the gum the fracture runs, and that assessment should not be delayed.

Vertical root fracture — prompt assessment, though the news is often not good. These generally cannot be restored predictably and the tooth is usually extracted. Our article on repairing a large tooth crack covers the assessment.

Any fracture with facial swelling, fever or difficulty swallowing — urgent, and if the swelling is spreading or affecting swallowing or breathing, emergency care rather than a dental appointment. Our article on a broken tooth with swelling covers this.

If a piece has come away, keep it. Store it in milk or saline — not in tissue, where it dehydrates within minutes, and not in water, which damages any attached cells.

Fragments can sometimes be bonded back onto the tooth. This works better than most people expect: the fit is exact, the colour and translucency match by definition, and the wear behaviour is that of enamel rather than composite. It is not always possible — a fragment that is in several pieces, badly dehydrated, or involves a pulp exposure may not be usable — but it is always worth bringing.

Our article on a chipped molar while eating covers the practicalities.

Cover a sharp edge. Orthodontic wax, sugar-free chewing gum or a small piece of temporary dressing material smoothed over the edge stops it lacerating your tongue or cheek. A tongue cut repeatedly on a sharp edge becomes an ulcer within a day. Our article on a broken tooth edge cutting the tongue covers this.

Keep the area clean but gentle. Rinse with warm salty water. Continue brushing, softly, over the broken tooth — plaque accumulating on exposed dentine accelerates the problem.

Manage pain appropriately. Over-the-counter analgesia taken according to the packet instructions. Do not place aspirin or any tablet against the gum; it causes a chemical burn of the soft tissue.

Avoid temperature extremes and chewing on that side. Softer foods, taken on the other side.

Cold compress to the outside of the cheek if the break followed an impact and there is swelling from the trauma itself.

Elevate your head at night if there is throbbing.

Do not file or grind the edge yourself. Nail files and emery boards remove enamel unpredictably and can expose more dentine than the fracture did.

Do not use superglue or household adhesives. Our article on why superglue should not be used on a crown covers the chemistry, and the same applies to tooth fragments.

Do not place a temporary dressing over a visible pink spot. A pulp exposure needs a specific dressing material placed under clean conditions.

Do not apply heat to the face. If infection is developing, heat encourages it to spread.

Do not ignore a tooth that has stopped hurting. A fracture into dentine that becomes painful and then goes quiet may mean the pulp has died rather than recovered.

Understanding the cause matters, because it usually predicts whether it will happen again.

Large existing restorations are the single biggest factor. A tooth with a filling occupying much of its width has thin, unsupported walls, and those walls flex every time you chew. Our article on whether a large filling can break your tooth covers the biomechanics.

Root-treated teeth without full coverage lose structure to both the original cavity and the access cavity.

Grinding and clenching apply repeated loads far above normal chewing forces, often overnight. Our article on whether teeth grinding can crack teeth covers this, and a night guard is the usual protective measure.

Untreated decay hollows a tooth from within.

Trauma — a fall, a sporting impact, a blow to the face. Our article on a broken tooth after an accident covers the additional assessment needed, since the supporting bone and adjacent teeth may also be injured.

Craze lines propagating — fine cracks accumulated over years that eventually extend.

If the cause was a weakened tooth rather than an unlucky olive stone, the teeth on the other side are often in a similar condition, and it is worth having them assessed at the same time.

For an enamel chip or a small dentine fracture, composite bonding or a white filling is usually sufficient.

For a larger fracture where a cusp has gone, full or partial coverage is generally needed — an onlay or a dental crown — because replacing the missing structure with filling material alone leaves the remaining walls unsupported. Our article on repairing a broken back tooth covers the options.

Where the pulp is involved, root canal treatment followed by a crown is the usual sequence. Our article on root canal treatment for a broken tooth covers what is involved.

Where the fracture extends too far below the gum or splits the root, extraction and replacement may be the realistic option. Our article on choosing between a crown and extraction covers that decision.

• Classify the fracture by which layer it has reached: enamel, dentine, pulp, crown-root or root.

• Enamel chips are routine; dentine exposure needs attention within days; a visible pink spot needs same-day care.

• Keep any fragment in milk or saline — it can sometimes be bonded back.

• Cover sharp edges with wax or sugar-free gum, keep the area clean, avoid chewing on that side.

• Do not file the edge, use household adhesives, or dress a visible pulp exposure.

• Teeth that break usually do so because they were already weakened, which predicts what happens next.

If you have broken a tooth, an assessment establishes which layer is involved and what the tooth needs. You can contact our team or use our emergency dentist service if there is pain, a visible pink spot or swelling.

This article is provided for general information only and does not constitute dental advice. The extent of a tooth fracture can only be determined through clinical examination and radiographs, and interim measures are not a substitute for professional treatment. If you have facial swelling, fever or difficulty swallowing or breathing, seek emergency care immediately.

Next review due: 18 August 2027