If a child knocks out a baby tooth, the rule is the opposite of an adult tooth: do not try to put it back. The leading dental trauma guidelines recommend that an avulsed baby (primary) tooth is not replanted, because pushing it back into the socket can damage the developing adult tooth sitting right underneath. This surprises many parents, who reasonably assume the tooth should go back in. With a baby tooth, leaving it out and seeing a dentist is the safer choice.
Key takeaways
- Do not replant a knocked-out baby tooth. This is the opposite of the rule for adult teeth.
- Replanting can harm the adult tooth forming underneath, or delay its eruption.
- A replanted baby tooth tends to fuse to the bone (ankylosis), which causes more problems than it solves.
- Control bleeding with gentle pressure, comfort your child, and see a dentist soon.
- Keep the tooth to show the dentist, but expect it will not be put back.
The one rule to remember: baby teeth do not go back
For a knocked-out adult tooth, speed and replanting matter enormously. For a baby tooth, the priority flips. The adult tooth is still forming in the bone, just below where the baby tooth sat. Forcing the baby tooth back into the socket risks pressing on that developing tooth, and the dental guidelines advise against replantation for this reason, along with the distress it causes a young child.
Why replanting a baby tooth causes problems
There are three main reasons dentists leave a knocked-out baby tooth out.
Risk to the adult tooth
Replanting can drive infection or pressure toward the adult tooth bud, which may disturb its enamel as it forms or push it off course as it erupts. The adult tooth can come through discoloured, pitted, or in the wrong position.
Ankylosis
A replanted baby tooth usually heals by fusing directly to the bone, called ankylosis, rather than reattaching through a normal ligament. An ankylosed tooth does not move with the growing jaw, so it can sink below the gum line over time and block or divert the adult tooth coming up behind it.
Distress and cooperation
Replanting and splinting a young child is difficult and frightening for them, with little benefit when the tooth was going to be lost naturally anyway.
What to do instead
Stay calm, because children take their cue from you. Sit your child upright and have them bite gently on a clean, damp gauze or face washer to slow the bleeding. A cold compress on the lip helps with swelling. Offer reassurance and, once the bleeding settles, a cool drink. Find the tooth and keep it to show the dentist, but do not push it back in. Then arrange a dental visit so the socket and the surrounding teeth can be checked.
Baby tooth vs adult tooth: opposite rules
| Step | Knocked-out baby tooth | Knocked-out adult tooth |
|---|---|---|
| Put it back in? | No | Yes, as soon as possible |
| Store it? | Keep to show the dentist only | Milk or saliva, not water |
| Main worry | Protecting the adult tooth underneath | Saving the knocked-out tooth itself |
| Urgency | See a dentist soon | See a dentist within the hour |
For the adult-tooth version of this, see how to store a knocked-out adult tooth.
What the dentist will check
The dentist confirms the tooth is fully out rather than pushed up into the gum, checks for any fragments left behind, examines nearby teeth, and may take an X-ray to look at the adult tooth underneath. They will explain whether a space needs watching and when the adult tooth is likely to appear. A lost baby tooth at the front rarely needs a space maintainer, but your dentist will advise based on your child's age and which tooth was lost.
Frequently asked questions
Will the missing baby tooth affect the adult tooth?
Usually the adult tooth still comes through normally, though sometimes a little earlier or later. The dentist will monitor the area. The bigger risk to the adult tooth comes from replanting the baby tooth, which is why it is avoided.
My child is in pain. What can I give them?
Children's pain relief such as paracetamol, dosed by weight per the packet, can help. Keep them on soft food and cool drinks for a day or two, and see the dentist if pain or swelling increases.
Should I be worried about a gap at the front?
A gap where a front baby tooth was is common and rarely a problem for the adult teeth. Your dentist will let you know if anything needs watching.
What if I am not sure whether it is a baby or adult tooth?
If you are unsure, keep the tooth in milk and see a dentist or call them straight away. When in doubt with what looks like an adult tooth, time matters, so seek advice quickly.
Talk to the team at Lumi Dental
If your child has knocked out a tooth, the team at Lumi Dental can check the socket and the developing teeth and put your mind at ease. Lumi Dental does not list its own prices here. See our current deals, ask for a written quote, or book with a general dentist in Melrose Park. The Child Dental Benefits Schedule may help with costs for eligible children.
This article is general information only and is not a substitute for personal dental advice. Please see a dentist about your child's situation.
