Sports Dental Trauma: The Avulsion Clock and What to Do Pitchside

Most dental injuries in sport are minor — a chipped edge, a cut lip, a tooth that aches for a day. One is not. When a tooth is knocked completely out of its socket, what happens in the following half hour largely determines whether it can be saved, and it happens in the hands of teammates, coaches and parents rather than dentists.

That sequence is worth knowing before you need it.

A tooth is not held in bone directly. It is suspended by the periodontal ligament, a thin layer of living cells attached to the root surface.

When a tooth is avulsed, some of those cells stay on the root. If they remain alive, the ligament can reattach when the tooth is replanted. If they die, the root becomes a foreign object and the body resorbs it — a process called replacement resorption, which eventually destroys the root.

Those cells die from drying out. Extra-oral dry time is the single most important variable in the whole event. Research consistently shows that survival falls steeply after roughly 15 to 20 minutes of dry storage, and that prospects beyond an hour of dry time are poor.

Everything in the sequence below exists to keep those cells wet.

1. Find the tooth. Handle it by the crown — the white part you normally see. Never touch or squeeze the root.

2. If it is dirty, rinse briefly. Cold running water or milk, a few seconds only. Do not scrub, do not use soap, do not use disinfectant, do not brush it. You are washing off debris, not cleaning the root.

3. Put it back in the socket, immediately, if you can. This is the single best action. Position it the right way round, press gently but firmly into place, and have the person bite lightly on a clean handkerchief or gauze to hold it. The socket is the ideal storage medium.

4. If replanting is not possible, store it wet. In descending order of preference:

• Cold milk — widely available, correct osmolality, and reliably good for several hours

• The injured person's own saliva — held inside the cheek, only if they are fully conscious and unlikely to swallow or inhale it

• A commercial tooth-preservation solution, if the first aid kit has one

• Saline

• Water is a last resort. It is hypotonic and causes the cells to swell and lyse, so it is better than dry but meaningfully worse than milk

5. Get to a dentist immediately. Within 30 minutes is the aim. Telephone ahead so they are ready.

6. Bring the tooth however it is stored. Never wrapped in tissue or kitchen roll — that dries it out.

A knocked-out baby tooth is not replanted. Pushing it back risks damaging the developing permanent tooth beneath. Control the bleeding, keep the child calm, and seek a dental assessment — but do not attempt to replace it. Our article on dental trauma in children covers the paediatric situation in full.

If you are not certain whether the tooth is adult or baby, seek advice rather than replanting.

Chipped tooth. Keep the fragment in milk — it can sometimes be bonded back on. Check for a pink or red dot in the fracture surface, which means the nerve is exposed and same-day care is needed. Our article on telling urgent from routine chips covers the assessment, and emergency dental bonding covers the repair.

Loosened but not displaced. Avoid using the tooth, eat soft food, seek assessment. Splinting may be required.

Displaced or pushed into the socket. Do not attempt to reposition it yourself. Same-day assessment.

Fractured root. Not visible externally. Suspected when a tooth is mobile or tender after impact and confirmed on radiographs.

Jaw injury. Difficulty closing the teeth together, numbness of the lip, or a step in the bite all suggest a jaw fracture and warrant urgent hospital assessment.

Cut lip or tongue. Apply pressure with clean gauze. Check for embedded tooth fragments — they are easily missed and cause persistent infection.

A tooth that survives the event may still lose vitality weeks or months later, so follow-up radiographs are part of the process, not an optional extra. Our article on whether a small chip can lead to root canal treatment later covers the delayed sequence.

Mouthguards reduce the risk and severity of dental injury by absorbing and distributing impact energy, by holding the lips away from the teeth, and by separating the arches so the lower jaw cannot be driven into the upper.

Stock mouthguards. Pre-formed, one size. Cheap, poorly fitting, and held in by clenching — which means they impede speech and breathing and tend to be spat out. Minimal protection.

Boil-and-bite. Softened in hot water and moulded in the mouth. Better than stock, but the material thins unpredictably where it is bitten through, and the thinnest part is often over the front teeth where protection is most needed.

Custom-made. Made in a laboratory from an impression or a digital scan. Even thickness where it matters, retentive without clenching, comfortable enough to be worn consistently. Multi-layer laminated versions are available for high-impact sport.

The most important property of any mouthguard is that it is actually worn. A custom guard is worn because it fits; that is most of its advantage.

Wear one for: rugby, boxing and martial arts, hockey, football, basketball, skateboarding, cycling and BMX, cricket when batting or keeping, skiing and snowboarding, gymnastics and trampolining.

Also: wear one over a fixed brace if you play contact sport — and note that aligners are not protective appliances and should be removed and replaced with a mouthguard.

Replace it when it no longer fits, shows tears or thinning, or annually for children and adolescents whose jaws are still growing.

Clean it by rinsing after use, brushing with cool water and mild soap, drying it before storing in a ventilated case, and keeping it out of hot cars and direct sunlight.

• Keep up regular dental check-ups; a heavily restored or decayed tooth fractures more readily

• Correct prominent upper front teeth where appropriate — increased overjet is a recognised risk factor for trauma. Our article on treating an overjet with aligners covers it

• Beware acid erosion from sports drinks, which thins enamel. Our article on how energy drinks damage enamel covers this

• Carry a small trauma kit: gauze, a sealed container, and long-life milk

• Make sure whoever is coaching knows the avulsion sequence

• Dry time decides the outcome for an avulsed adult tooth; aim to replant within 30 minutes.

• Handle the crown only, never the root, and never scrub it.

• Replanting into the socket immediately is the best action.

• If storing, milk first, then saliva, then saline; water only as a last resort.

• Never replant a baby tooth.

• Custom mouthguards protect better than boil-and-bite, mainly because they are worn consistently.

• Follow-up matters — teeth can lose vitality weeks after the injury.

What should I do if a tooth is knocked out during sport?

Pick it up by the crown, rinse briefly if dirty, and push it back into the socket straight away if you can. If not, store it in milk and get to a dentist within 30 minutes.

Are custom mouthguards worth it compared with shop-bought ones?

They provide more consistent thickness over the front teeth, stay in place without clenching, and are comfortable enough to be worn every time. That last point is usually the deciding one.

Can a chipped tooth from sport heal on its own?

No. Enamel does not regenerate. The chip needs assessing and, in most cases, restoring.

Should I wear a mouthguard for non-contact sport?

Consider it for anything with a fall or collision risk — cycling, skateboarding, skiing, gymnastics. Dental injuries are not confined to contact sports.

How often should a mouthguard be replaced?

When it no longer fits or shows damage. For children and adolescents, annually or more often, because jaws are still growing.

Can I wear my aligners instead of a mouthguard?

No. Aligners are thin and not designed to absorb impact. Remove them for sport and wear a proper mouthguard.

If you or your child plays sport, a properly fitted mouthguard is a straightforward piece of preparation. If an injury has already happened, prompt assessment matters.

You can contact our team at our Wimpole Street practice, or read about emergency dental care and night guards.

This article provides general first aid information about sports dental injuries and does not constitute individual dental advice or replace urgent professional care. Suspected jaw fracture, head injury, loss of consciousness or uncontrolled bleeding require immediate medical attention. Wimpole Dental is regulated by the Care Quality Commission, and our clinicians are registered with the General Dental Council.

Next review due: 13 September 2027