How Do Dentists Fix Fractured Teeth? What You Should Know

"I've fractured a tooth" covers an enormous range of situations. At one end, a barely visible line in the enamel that has been there for years and causes nothing. At the other, a tooth split vertically to the root, which cannot be saved.

The treatment is determined almost entirely by one question: where does the fracture run, and how much sound tooth is left? Everything else follows from that.

This article explains how fractures are classified, what treatment each type usually requires, and what to do in the first hour after one happens.

If a tooth has just fractured:

1. Find the fragment if you can. Keep it in milk or saliva. Some fragments can be bonded back, and a matching piece of your own enamel is the best possible material. If it is a whole tooth knocked out, that is a different and more urgent situation.

2. Rinse gently with warm water. Do not scrub.

3. Control bleeding from soft tissue with gauze and steady pressure.

4. Cover a sharp edge with orthodontic wax or sugar-free chewing gum to protect your tongue and cheek.

5. Avoid chewing on that side.

6. Take over-the-counter pain relief as directed on the packaging if needed.

7. Contact a dentist promptly. Same day if there is pain, visible pink or red tissue in the fracture surface, or a large piece missing.

Our article on what to do with a chipped molar covers the immediate handling in more detail.

Seek urgent medical care — 999 or an emergency department — if the injury involved a blow to the head, if there is loss of consciousness, if a jaw fracture is suspected, or if there is significant facial swelling or difficulty breathing.

Superficial cracks confined to enamel. Extremely common, particularly in older teeth, and generally of no consequence beyond appearance. They may take up stain and become more visible over time. Treatment is cosmetic if anything — our article on addressing enamel crazing with minimally invasive resin covers the options.

A piece of the biting surface breaks away, commonly around a large existing filling. The pulp is often not involved. Treatment is usually a restoration — a composite, an onlay or a crown — depending on how much of the tooth remains.

A crack extending from the biting surface towards the root, through enamel and into dentine, possibly into the pulp. The tooth is still in one piece. This is the diagnostically awkward category, and the origin of the term cracked tooth syndrome — sharp pain on releasing a bite, sensitivity to cold, and pain that is hard to localise.

Treatment depends on the depth. If the pulp is not irreversibly inflamed, a cuspal-coverage restoration — typically a crown or onlay — that holds the tooth together is the usual approach. If the pulp is involved, root canal treatment is needed first. Our article on whether a crown can stop a tooth cracking explains the principle.

The crack has progressed and the tooth has separated into distinct segments. Whether anything can be saved depends on where the split runs. Sometimes one segment can be removed and the remainder restored; often the tooth is not salvageable.

A fracture beginning in the root and extending towards the biting surface. Often found in root-treated teeth. Symptoms are frequently minimal until a localised infection develops. These are generally not restorable, and the tooth usually requires extraction.

Fractures are notoriously difficult to diagnose, and the process is more involved than a look and an X-ray.

History. What happened, when, what provokes the pain, whether it is sharp or dull, whether it occurs on biting or releasing.

Visual examination with magnification and good lighting. Transillumination — shining a light through the tooth — often reveals a crack that is otherwise invisible, because light stops at the fracture line.

Dye staining. Methylene blue or a similar dye can be applied to make a crack visible.

Bite testing. A device such as a Tooth Slooth is used to load individual cusps in turn. Pain on release from a particular cusp is characteristic of a crack.

Pulp testing. Cold and electric testing to establish whether the nerve is healthy, reversibly inflamed or non-vital. This determines whether root canal treatment is needed.

Periodontal probing. A narrow, deep, isolated pocket at one point is a classic sign of a vertical root fracture.

Radiographs. These often do not show cracks, because a crack running in the plane of the X-ray beam is invisible on a two-dimensional image. They show bone levels, existing restorations, the extent of decay and periapical changes. A CBCT scan is sometimes used where the picture is unclear.

Removal of existing restorations. Sometimes the only way to see the full extent is to take out the old filling and look. This is a legitimate diagnostic step and it is not unusual for the treatment plan to change at that point.

This is why a definitive answer on the first visit is not always possible, and why an interim restoration is sometimes placed while the tooth is monitored.

For small chips and fractures confined to enamel or shallow dentine. Tooth-coloured resin is bonded directly, shaped and polished in a single visit. Conservative, repairable and relatively quick. Not suitable where a large volume of tooth is missing or where the repair would carry heavy biting load. Our composite bonding page explains the process.

Where the fragment has been kept and is in good condition, it can sometimes be bonded back. The aesthetic result can be excellent because the colour and translucency match perfectly. It is technique-sensitive and the bond is not as strong as intact tooth, but it is worth attempting where circumstances allow.

For front teeth with fractures affecting appearance where bonding is insufficient. Our porcelain veneers page covers the approach. Our article on chipped teeth and treatment options sets out the comparison.

Where a cusp has fractured or a crack requires the tooth to be held together, a restoration covering the biting surface is usually indicated. An onlay is more conservative than a full crown and is often preferred where sufficient tooth remains. Our dental crowns page explains the process.

Required where the pulp is irreversibly inflamed or non-vital — indicated by prolonged pain to cold, spontaneous pain, pain waking you at night, or a periapical radiolucency. The tooth is then restored, almost always with cuspal coverage since a root-treated posterior tooth is more prone to fracture. Our root canal page covers the treatment, and our article on how a small chip can lead to root canal treatment explains the progression.

Where the fracture extends significantly below the bone level, where the tooth is split, or where a vertical root fracture is present. The tooth is removed and replacement discussed — an implant, a bridge, or a denture. Our article on ridge preservation after extraction explains why the socket is often grafted at the time of removal.

• Large existing restorations that leave thin remaining walls. The most common single factor in posterior fractures.

• Root-treated teeth without cuspal coverage, which have lost internal structure and are more brittle.

• Grinding and clenching, which apply repeated forces well above normal function. Our article on whether grinding can crack teeth covers the mechanism.

• Biting something unexpectedly hard — an olive stone, a popcorn kernel, a bone fragment.

• Trauma from sport, falls or accidents.

• Sudden temperature changes, occasionally, from very hot and very cold in quick succession.

• Age-related fatigue, since enamel and dentine accumulate microdamage over decades.

Fractures do not heal. A crack in a tooth is not like a crack in bone; there is no biological repair mechanism.

What tends to follow is progression. Bacteria enter through the fracture line, the pulp becomes inflamed and then infected, and the crack propagates under repeated loading. A tooth that could have been restored with an onlay becomes one needing root canal treatment; a tooth needing root canal treatment becomes one needing extraction.

Our articles on how a fractured tooth lets bacteria in and the hidden cost of ignoring a small chip cover this progression.

The practical point is that early assessment usually means a smaller, less expensive intervention.

My tooth chipped but does not hurt. Do I still need to see a dentist?

Yes, though not necessarily urgently. Absence of pain does not indicate the fracture is superficial — it may simply mean the pulp has not yet responded. An assessment establishes how deep it runs and whether the pulp is healthy. A rough edge also tends to accumulate plaque and can irritate the tongue.

Can a cracked tooth heal on its own?

No. Teeth have no mechanism to repair a fracture. The pulp can lay down some reparative dentine internally in response to irritation, but the crack itself remains and tends to propagate under loading.

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

Radiographs are two-dimensional, and a crack running parallel to the X-ray beam produces no visible change. Cracks are more often diagnosed through transillumination, dye, bite testing and direct examination than through imaging.

Will I need a crown?

It depends on how much tooth remains and whether the fracture involves a cusp. Small fractures are often restored with composite. Where a cusp has broken or a crack needs to be held together, cuspal coverage — an onlay or crown — is usually indicated. Root-treated posterior teeth almost always need it.

Is it better to save the tooth or have an implant?

Where a tooth can be restored predictably, saving it is generally preferred — nothing replaces a natural tooth entirely. Where the fracture extends below bone level or the tooth is split, extraction is the realistic option. The decision rests on the specific prognosis, not a general rule. Our article on whether implants are worth it covers the comparison.

What if a crown has fractured rather than the tooth?

That is a different situation and often more straightforward, though the underlying tooth needs checking. Our article on broken crown emergency care covers the immediate steps.

Can I prevent fractures?

Partly. Wearing a night guard if you grind, wearing a mouthguard for contact sport, avoiding using teeth as tools, being careful with hard foods, and having large old restorations reviewed before they fail all reduce the risk meaningfully.

If you have fractured a tooth, keep any fragment in milk, avoid chewing on that side, and arrange an assessment. If there is significant pain, visible pink tissue at the fracture surface, or a large portion missing, treat it as same-day.

If you have an intermittent sharp pain on biting that you have not been able to pin down to a particular tooth, that is worth investigating — it is the classic presentation of a crack, and cracks are easier to treat before the pulp becomes involved.

You can contact our team at our Wimpole Street practice. Our emergency dentist and dental crowns pages explain what is involved.

This article provides general information and does not constitute individual dental advice. The extent of a fracture and the appropriate treatment can only be determined following clinical examination and, where indicated, radiographs. Treatment outcomes vary between individuals, and some fractured teeth cannot be saved. If you have sustained a head injury, facial swelling, difficulty breathing or swallowing, seek urgent medical care by calling 999 or attending an emergency department. Wimpole Dental is regulated by the Care Quality Commission, and our clinicians are registered with the General Dental Council.

Next review due: 12 September 2027