A Knocked-out Tooth

About one in four children in the UK will injure a front tooth at some stage. Tooth injuries also happen to some adults. Sometimes a tooth may be completely knocked out. This leaflet tells you what to do.

These teeth start coming out naturally at about age 6 or 7. If one is knocked out earlier by accident - leave it out. Do not try to put it back, as this may damage the adult tooth growing underneath. The adult tooth will grow eventually. Give some paracetamol mixture (Calpol®, Disprol®, etc) or ibuprofen if the injured gum is sore.

If the tooth is only chipped or damaged, it may require the attention of a dentist, but this is not an emergency.

These are commonly knocked out in older children and sometimes in adults. If one of these teeth is knocked out it is vital that:

  • It should be put back into its socket as soon as possible, and then you see a dentist as soon as possible to secure the tooth. This should be done within an hour of the injury.

An adult at the scene of the accident will usually be able to place the tooth back into its socket in the injured person's mouth.

  • Do not delay doing this. Do not wait to see a dentist.
  • If the tooth is clean, do it straightaway and then seek dental help.
  • Hold the tooth by the crown (the white shiny part normally seen in the mouth) and not the root. The root has delicate cells needed to attach the tooth so try not to touch this part.
  • Take care to get the tooth the right way around.
  • Once back in, get the injured person to bite gently on a handkerchief until seen by a dentist.

What if the tooth is dirty?

A tooth may be knocked into some mud or dirt. Rinse the tooth in some cold water or milk. Do not scrub it or put it in disinfectant. This will damage the delicate cells on the root needed to attach the tooth back to the gum.

Why is it best put back straightaway?

The cells at the root of the tooth will usually attach firmly back to the tooth socket if they do not die. These cells at the root of the tooth will soon dry out and die if the tooth is not put back quickly. If they die, the tooth will not attach again. The sooner a tooth is put back, the greater the chance of success.

What if the tooth cannot be put back in?

Put the tooth in a cup of milk or saline and see a dentist as soon as possible. The tooth must be kept moist. Milk is the ideal liquid to put the tooth in. Do not put the tooth in water, as plain water damages the delicate cells whereas milk or saline is much better at preserving the cells. If milk or saline is not available, put the tooth in the injured person's mouth between their cheek and the gum. If the tooth is kept moist with any of these methods until it is put back in its socket there is a greater chance of permanent recovery. It may still be successful up to 24 hours after the accident.

If you cannot see a dentist immediately after the accident, go to the local casualty (accident and emergency) department.

Preventing injury to teeth

Teeth are often damaged in accidents during sports. This can be prevented with a mouth guard which can be bought from sports shops or be fitted by your dentist. Some helmets also offer protection to the teeth.

What happens next?

Children or adults who have certain heart problems such as murmurs or valve problems may need to take a course of antibiotic medicine after a tooth is knocked out. Antibiotics can be prescribed by the dentist or the emergency department.

A tooth which has been replaced into its socket will usually be attached to a neighbouring tooth with a splint to hold it in place while it heals. Sometimes a replaced tooth will become discoloured and may require further work by the dentist.

Original Author:
Dr Tim Kenny
Current Version:
Peer Reviewer:
Dr Helen Huins
Last Checked:
04/11/2013
Document ID:
4377 (v39)
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