Dental Trauma in Children: What Parents Need to Know
Dental injuries in children happen in the least dramatic circumstances — a trampoline, a paddling pool edge, a scooter, a sibling. They rarely happen at a convenient hour, and parents are almost always making decisions in the first few minutes without any information to hand.
Those first few minutes matter more than almost anything that follows. For a knocked-out permanent tooth in particular, what happens in the first hour has a greater bearing on the outcome than any subsequent treatment. Knowing two or three specific things in advance genuinely changes results.
This article is written to be read before it is needed.
What Should Parents Do After a Dental Injury?
What matters most in the first hour?
For a knocked-out permanent tooth, the priority is to replant it in the socket as quickly as possible — ideally within minutes. Hold it by the crown, never the root, rinse it briefly in milk or the child's saliva if visibly dirty, push it gently back into the socket the right way round, and have the child bite on a clean cloth to hold it while you seek immediate dental care. If replanting is not possible, store it in cold milk — not water — and get to a dentist without delay. A knocked-out baby tooth should never be replanted, because doing so risks damaging the developing permanent tooth underneath. In all cases, check first for signs of head injury, and attend A&E if there is loss of consciousness, vomiting, confusion, or a suspected facial fracture.
Common Types of Dental Injury
Chipped or fractured crown. The most frequent injury. May involve enamel only, extend into dentine, or expose the nerve — the last is usually visible as a pink or red spot and needs urgent attention. See our page on chipped tooth and our article on an exposed nerve after a broken tooth.
Root fracture. Not visible externally; diagnosed radiographically. The tooth may feel loose or displaced.
Luxation injuries. The tooth is displaced without being lost — pushed sideways, pushed up into the bone (intrusion), or partially out of the socket (extrusion). Intrusion of a baby tooth is a particular concern because of the proximity of the developing permanent tooth.
Avulsion. The tooth is completely knocked out. Handled entirely differently depending on whether it is a baby or permanent tooth.
Soft tissue injuries. Cut lips, tongue and gums, often bleeding impressively. Apply firm pressure with a clean cloth. Check for embedded fragments of tooth or grit.
Alveolar fracture. A segment of bone with several teeth moves together. Requires urgent care.
Why Children's Teeth Are Different
• The pulp is proportionally larger, so a fracture that would be superficial in an adult tooth may expose the nerve in a child's.
• Roots of young permanent teeth are still forming. A tooth with an open apex has a better blood supply and greater capacity to recover after injury — one reason prompt treatment is so valuable in this age group.
• Bone is more elastic, which makes displacement injuries more common than fractures in younger children.
• Baby teeth sit directly above developing permanent teeth, so any injury pushing a baby tooth upwards can affect the successor.
• Front teeth protrude more in children with an increased overjet, which measurably raises injury risk. Our page on overbite and overjet covers this.
Immediate Steps
1. Stay calm and check the child first. Head injury takes precedence over the tooth. Loss of consciousness, drowsiness, vomiting, confusion or a suspected fracture means A&E.
2. Control bleeding with firm pressure using a clean cloth or gauze for ten minutes.
3. Find the tooth or fragment. Fragments can sometimes be bonded back.
4. For a permanent tooth that has been knocked out, replant immediately as described above, or store in cold milk.
5. Never store a tooth in water, and never scrub the root — the cells on the root surface are what allow reattachment.
6. For a baby tooth that has been knocked out, do not replant. Take it with you and seek dental advice.
7. Contact a dentist immediately, explaining that it is a trauma. Our emergency dentist page explains how urgent appointments work.
8. Soft diet, cold compress, age-appropriate pain relief as directed on the packaging.
How Injuries Are Assessed
At the appointment, expect:
• A history of exactly what happened, when, and where — the mechanism matters
• Examination for head injury signs and for any missing fragments
• Assessment of mobility, displacement and how the teeth meet
• Sensibility testing of the affected and adjacent teeth, interpreted cautiously in the days after trauma
• Radiographs, including views to check for root fracture, displacement and any fragment embedded in the lip
• Splinting where a tooth is loose or has been replanted
• A follow-up schedule, because trauma outcomes evolve over months and years
Follow-up is not optional. A tooth that appears fine at two weeks may darken, lose vitality or develop root resorption months later. Our article on whether a small chip can lead to root canal treatment later explains why.
Baby Teeth and Permanent Teeth: Different Approaches
The guiding principle with baby teeth is protection of the developing permanent tooth underneath.
• A knocked-out baby tooth is not replanted.
• A displaced baby tooth may be repositioned, left to reposition itself, or removed depending on the direction and severity of displacement.
• A severely intruded baby tooth is assessed radiographically for its relationship to the permanent tooth germ.
• Chipped baby teeth are usually smoothed or restored with composite. Our article on why dentists do not replant baby teeth covers the reasoning.
Permanent teeth are treated far more aggressively in terms of preservation — replanted, splinted, monitored and, where necessary, root treated to keep them.
Possible effects on the developing permanent tooth after a baby tooth injury include white or yellow-brown marks on the enamel, a change in shape, or altered eruption timing. These are assessed as the tooth emerges. See our page on white spot lesions.
Prevention
• A properly fitted mouthguard for contact sports. A custom-made guard fits better and stays in place better than a boil-and-bite version. Our night guards page covers how custom appliances are made.
• Orthodontic assessment where front teeth protrude significantly, since reducing an increased overjet reduces injury risk.
• Helmets for cycling and scooting, and supervision around hard surfaces and pool edges.
• Regular examinations so that any injury history is documented and monitored. Our children's dentistry page explains what routine paediatric care involves.
The NHS provides guidance on broken or knocked-out teeth at nhs.uk.
When to Seek Urgent Care
Seek immediate attention if:
• A permanent tooth has been knocked out or displaced.
• A tooth is loose, has moved, or the bite feels different.
• A fracture shows a pink or red spot, indicating nerve exposure.
• There is bleeding that does not stop with ten minutes of firm pressure.
• The child cannot close their mouth properly or the jaw appears deformed.
• There are signs of head injury — attend A&E first.
• A tooth darkens, becomes painful or the gum swells in the weeks after an injury.
Key Points to Remember
• Check for head injury before addressing the tooth.
• A knocked-out permanent tooth should be replanted immediately, held by the crown only.
• If replanting is not possible, store the tooth in cold milk — never water.
• A knocked-out baby tooth must never be replanted.
• Keep any fragments; they can sometimes be bonded back.
• Children's teeth have proportionally larger pulps, so fractures expose the nerve more readily.
• Injuries to baby teeth can affect the developing permanent tooth beneath.
• Follow-up over months and years is essential, because outcomes evolve.
Frequently Asked Questions
1. Should I go to A&E or a dentist?
A dentist for the tooth itself. A&E for suspected head injury, facial fracture, uncontrolled bleeding or when no dental care is available and the injury is significant. If in doubt about a head injury, go to A&E first.
2. How quickly must a knocked-out permanent tooth be replanted?
As quickly as possible. Outcomes are considerably better when the tooth is replanted within minutes, and the likelihood of long-term retention declines with each period the tooth spends outside the socket in a dry state.
3. Will an injury to a baby tooth affect the adult tooth?
It can. Possible effects include enamel marks, altered shape or changed eruption timing. This is why injured baby teeth are monitored radiographically as the permanent successor develops.
4. Can a chipped baby tooth be repaired?
Frequently yes, with smoothing or a composite restoration depending on the extent. Where the nerve is exposed or the tooth is close to natural exfoliation, other approaches may be appropriate.
5. Does every dental injury need an X-ray?
Not every one, but radiographs are commonly indicated to check for root fracture, displacement, damage to the developing tooth, or a fragment embedded in the lip. Your dentist will explain the reason for any image taken.
6. My child's tooth has gone grey weeks after a knock — is that serious?
It should be assessed. Discolouration after trauma indicates a change within the tooth and may or may not require treatment, depending on whether the tooth is a baby or permanent tooth and whether there are other signs. See our page on discolouration and stains.
Conclusion
Most childhood dental injuries have good outcomes when they are dealt with promptly and followed up properly. The two things worth remembering in advance are simple: never replant a baby tooth, and if a permanent tooth comes out, get it back in the socket or into milk within minutes.
If your child has had a dental injury, or you would like a preventive assessment including a sports mouthguard, you can arrange an appointment with our team at 22 Wimpole St, London W1G 8GQ, or telephone 020 7183 0692.
Dental symptoms and treatment options should always be assessed individually during a clinical examination.
Dental Disclaimer
This article is for general educational information only and is not professional dental advice, diagnosis, or a treatment recommendation. Information here is general and cannot replace an in-person assessment by a qualified, GDC-registered dental professional. Symptoms, suitability, fees, timelines, and outcomes vary according to individual clinical circumstances. If you have pain, swelling, or other concerning symptoms, seek prompt professional dental care. Always request a written treatment plan and cost estimate before proceeding with treatment.
Written Date: 26 August 2026
Next Review Date: 26 August 2027
Written by Dr Niknaz Rostam Yazdi · reviewed by Dr Niknaz Rostam Yazdi, GDC 328954
This article is general information, not personal clinical advice. For a diagnosis and a plan tailored to you, book a consultation with a GDC-registered dentist.
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