Can You Replant a Baby Tooth? Why Dentists Advise Against It
Most parents have absorbed one piece of dental first aid: if a tooth is knocked out, put it back in as quickly as possible.
That advice is correct — for permanent teeth. Applied to a baby tooth, it is not just unhelpful but potentially harmful.
The reason is not obvious from looking at the child. It concerns what lies directly above the socket, which is the developing permanent tooth.
Can a Knocked-Out Baby Tooth Be Put Back In?
My child has knocked out a baby tooth — should I replant it?
No. Current guidance from paediatric dental organisations advises against replanting avulsed primary teeth. The developing permanent tooth sits immediately above the roots of the baby tooth, separated by a thin layer of bone, and pushing a baby tooth back into its socket risks damaging that developing tooth germ. The consequences can include enamel defects, discolouration, malformation, or disturbed eruption of the permanent tooth — problems that will be visible for the child's whole adult life. There is also a risk of the child inhaling or swallowing a loosely replanted tooth. The correct response is to control any bleeding, comfort the child, and seek a dental assessment.
How Baby Teeth Differ From Adult Teeth
Primary teeth are smaller, whiter, and have thinner enamel and dentine than permanent teeth. Their roots are proportionally shorter and more slender, and they resorb naturally as the permanent successor develops beneath.
The crucial difference for trauma is anatomical position. The developing permanent tooth germ sits in the bone directly above the roots of the primary tooth, in what is called the follicular space, separated by only a thin bony plate.
The bone in a young child is also less dense and more elastic than adult bone, which is why primary teeth are more often displaced or knocked out entirely rather than fractured.
Why Replanting Can Cause Harm
Direct trauma to the permanent tooth germ. Forcing a root back into the socket can push against the developing tooth, disrupting the cells forming its enamel.
Enamel defects. Damage to ameloblasts during enamel formation produces white or yellow-brown discolouration, or hypoplastic defects where enamel is thin or missing. These are permanent.
Crown malformation. More severe trauma can distort the shape of the developing crown.
Root dilaceration. A sharp bend in the root of the permanent tooth, which can prevent normal eruption and complicate later orthodontic treatment.
Disturbed eruption. The permanent tooth may erupt out of position, late, or fail to erupt at all.
Infection risk. A replanted primary tooth is likely to become necrotic and infected, and infection in that region can itself damage the developing successor.
Aspiration risk. A loosely replanted tooth may be inhaled or swallowed.
The permanent incisors are forming during roughly the same years that these injuries most commonly occur, which is precisely why the risk is significant.
What to Do When a Child Knocks Out a Baby Tooth
1. Stay calm — children take their cue from the adult present
2. Do not attempt to replant the tooth
3. Control bleeding by having the child bite gently on clean gauze or a clean cloth for around ten minutes
4. Apply a cold compress to the outside of the lip or cheek to reduce swelling
5. Find the tooth if possible — not to replant, but so it can be confirmed the tooth is accounted for and not lodged in soft tissue or inhaled
6. Give age-appropriate pain relief if needed, following the packaging instructions
7. Offer soft, cool foods for a day or two
8. Seek a dental assessment, promptly
If the tooth cannot be found, this should be reported. A tooth may be embedded in the lip, swallowed, or in rare cases inhaled, and imaging may be needed.
Seek urgent medical attention if the child has lost consciousness, is vomiting, is unusually drowsy, or has a persistent headache after a head injury — these are matters for a doctor rather than a dentist.
Why Assessment Still Matters
Even though the tooth is not going back, a dental examination is worthwhile:
• To check for other injuries — fractures of adjacent teeth, damage to the bone, or soft tissue lacerations
• To confirm the tooth is fully out and no root fragments remain
• To assess whether adjacent teeth have been displaced
• To take radiographs where indicated
• To advise on space maintenance if the tooth was lost early
• To establish a baseline for monitoring the permanent successor
See children's dentistry and broken tooth.
When Professional Dental Assessment May Be Needed
Seek assessment if:
• A tooth has been knocked out, loosened, or displaced
• A tooth has been chipped or broken — see chipped tooth
• There is bleeding that does not settle with pressure
• The child has pain that persists — see toothache
• A tooth darkens in the days or weeks after an injury
• There is swelling of the gum or face — see facial or jaw swelling
• The tooth cannot be accounted for
Discolouration developing weeks after trauma is common and does not always require treatment, but it should be assessed and monitored. See emergency dentist.
The NHS provides general information about broken or knocked-out teeth at nhs.uk/conditions/broken-tooth/.
Protecting Children's Teeth From Injury
• Use a mouthguard for contact sports and activities with fall risk
• Supervise young children around hard surfaces and stairs
• Ensure car seats and cycle helmets are appropriately fitted
• Discourage running with objects in the mouth
• Attend regular check-ups so any developmental concerns are identified early
• Address prominent front teeth, which are more vulnerable to injury — see overbite and overjet
Children with prominent upper incisors have a measurably higher risk of dental trauma, which is one consideration when orthodontic treatment timing is discussed.
Key Points to Remember
• Avulsed baby teeth should not be replanted
• The permanent tooth germ sits directly above the primary tooth roots
• Replanting risks enamel defects, malformation, and disturbed eruption
• Permanent incisors are forming during the years these injuries occur
• Control bleeding, comfort the child, and seek assessment
• Find the tooth if possible, so it can be accounted for
• Assessment matters even though the tooth is not going back
Frequently Asked Questions
1. What happens if a baby tooth is accidentally replanted?
Contact a dentist promptly. The tooth will usually need removing, and the permanent successor will be monitored. The outcome depends on how much force was used and the stage of development of the tooth beneath.
2. Should we keep the knocked-out tooth?
There is no clinical need to preserve it, but bring it to the appointment if convenient so it can be confirmed complete and no root fragment has been left behind.
3. At what age do children normally lose baby teeth?
Typically from around six years, starting with the lower front teeth, continuing until around twelve. Losing a front tooth well before six is usually the result of trauma rather than natural exfoliation.
4. How can I tell whether it is a baby tooth or an adult tooth?
Baby teeth are smaller, whiter, and have shorter, more slender roots that are often partly resorbed. The child's age is the strongest clue — before around six, front teeth are almost always primary. If unsure, treat it as a permanent tooth and seek immediate advice.
5. Does losing a baby tooth early affect the adult tooth?
The permanent tooth usually erupts normally, though sometimes later than expected because the overlying gum tissue thickens. Early loss of back baby teeth is more likely to cause space problems and may need a space maintainer.
6. Will my child need a replacement tooth?
For front teeth, usually not — the space is temporary and the permanent tooth will follow. Where a back primary tooth is lost early, a space maintainer may be advised to prevent adjacent teeth drifting.
Conclusion
The instinct to put a knocked-out tooth back is a good one, and for permanent teeth it is exactly right. For baby teeth it is the wrong response, and the reason is entirely about protecting the tooth that has not come through yet.
The practical advice is simple: control the bleeding, comfort the child, find the tooth if you can, and get an assessment. The gap will close itself in due course, and the priority in the meantime is the permanent tooth developing above it.
If your child has had a dental injury, you are welcome to book an appointment at Wimpole Dental, 22 Wimpole St, London W1G 8GQ, or call 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: 14 August 2026
Next Review Date: 14 August 2027
Written by Dr Andreia Phipps · reviewed by Dr Andreia Phipps, GDC 229601
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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