Answers
I have cracked a tooth — what should I do?
See a dental professional as soon as possible. Meanwhile, avoid chewing on that side, rinse with warm salt water, and use over-the-counter pain relief if needed. Cracks worsen with use, and early treatment preserves more tooth.
What should I do in the first hour?
The aim is to protect the tooth from further loading and keep the area clean until it can be examined.
If a piece has broken off, keep it — bring it with you, in milk or saline if it is a large fragment. In some cases a fragment can be bonded back on. If the broken edge is sharp and cutting your tongue or cheek, orthodontic wax or sugar-free chewing gum pressed over it is a reasonable temporary measure.
Do not use the tooth. A crack that is stable can propagate under a single hard bite, and a crack that reaches the pulp or the root changes the prognosis entirely.
- Stop chewing on that side completely, including soft food
- Rinse gently with warm salt water to keep the area clean
- Keep any broken fragment, ideally in milk or saline
- Use ordinary over-the-counter pain relief if you need it, as directed on the packet
- Cover a sharp edge with orthodontic wax if it is cutting your tongue
- Apply a cold compress to the outside of the face if there is swelling or it followed a knock
- Book to be seen as soon as you can, even if it does not hurt
Do not place an aspirin or any painkiller directly against the gum. It does not help the tooth and it burns the soft tissue. Ask a pharmacist about appropriate pain relief for you, particularly if you take other medication.
When is a cracked tooth an emergency?
Most cracks are urgent rather than emergencies — they need to be seen promptly, but not in the middle of the night. Some situations do not wait.
Get urgent care if there is swelling of the face or jaw, if you have fever with dental pain, if you have difficulty swallowing or breathing, if bleeding will not stop, if the tooth was knocked out or pushed out of position, or if the pain is severe and not controlled by ordinary painkillers.
Swelling that is spreading, particularly towards the eye or under the jaw, is the one that matters most. A dental infection that spreads into the tissues of the face or neck is a medical emergency, not a dental inconvenience.
If a permanent tooth has been knocked out completely, this is time-critical. Hold it by the crown, never the root. If it is dirty, rinse briefly in milk or saline — do not scrub it. Reinsert it into the socket if you can, or store it in milk, and get to a dental professional immediately.
What kind of crack is it, and does it matter?
It matters enormously. "Cracked tooth" covers everything from a cosmetic surface line to a fracture that means the tooth cannot be kept.
Craze lines are shallow cracks in enamel only. They are extremely common in adults, do not usually cause symptoms, and often need no treatment at all.
A fractured cusp is a piece of the biting surface breaking away, often around a large old filling. The pulp is frequently unaffected and the tooth can usually be restored.
A cracked tooth proper is a crack running from the biting surface towards the root, with the segments still together. Prognosis depends on how far it extends and whether it has reached the pulp — this is the group where early treatment makes the biggest difference.
A split tooth is a crack that has separated into distinct segments. Sometimes a segment can be removed and the rest restored; sometimes the tooth cannot be saved. A vertical root fracture starts in the root and is usually diagnosed late, and these teeth are often not restorable.
You cannot tell these apart yourself, and neither can a photograph. Diagnosis usually involves radiographs, transillumination, magnification and a bite test on individual cusps.
How is a cracked tooth treated?
It depends on the type of crack, how deep it runs, and whether the pulp is involved.
Where the crack is confined and the pulp is healthy, treatment aims to bind the tooth together and stop the segments flexing, because it is the flexing that hurts and that drives the crack deeper. A bonded restoration that covers and supports the weakened cusps is often the approach, and covering the biting surface can be done without reducing the whole tooth for a crown.
Where the crack has reached the pulp and the pulp is irreversibly inflamed or infected, root canal treatment is generally needed before restoring the tooth. Where the crack extends below the bone or splits the root, extraction may be the only realistic option, and the discussion moves to replacing the tooth.
Cracks are also the situation where an honest prognosis matters most. Some cracked teeth are restored and last for years. Some are restored, remain symptomatic, and go on to need more treatment. A dental professional should tell you which category yours is likely to be, including when they cannot be certain.
Why did my tooth crack?
Usually not from one dramatic event. Most cracks in adult teeth are the end of a long process.
A large old filling is the most common background. A filling does not strengthen a tooth — it fills a space, and the walls left around a big one can be thin and unsupported. Decades of chewing flexes them until one gives way. This is why replacing a large old filling before it fractures the tooth is worth considering.
Grinding and clenching apply forces far beyond normal chewing, often at night. Biting something hard — ice, a bone fragment, a popcorn kernel, a bottle cap — is the trigger people remember, but it is often the last load on a tooth that was already compromised. Root-treated teeth, which are more brittle, and large temperature swings can also contribute.
Common questions
Can a cracked tooth heal on its own?
No. Enamel and dentine do not repair themselves once cracked, and the crack tends to extend with continued chewing. A shallow craze line may need no treatment, but that is a crack that does not require repair, not one that has healed.
My cracked tooth does not hurt. Do I still need to see someone?
Yes. Pain is a poor guide to how serious a crack is — some deep cracks are painless until they reach the pulp. Being seen early is what keeps the more conservative options available.
Why does my cracked tooth only hurt when I release a bite?
That pattern — pain on releasing rather than on biting down — is characteristic of a crack, because the segments move apart and then snap back together. It is worth mentioning specifically, as it helps identify which tooth is involved.
Will a cracked tooth need a crown?
Not necessarily. What a cracked tooth needs is support that stops the cusps flexing, and where enough healthy structure remains that can often be achieved with a bonded restoration covering the biting surface, without reducing the whole tooth.
How long can I leave a cracked tooth?
As little time as possible. There is no safe waiting period — cracks propagate unpredictably, and the difference between a restorable crack and an unrestorable one can be a few weeks of chewing.