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First Aid

A tooth has been knocked out. What to do right now.

Step-by-step first aid for a knocked-out permanent tooth, including how to handle it, what to store it in, and the time window that determines whether it can be saved.

Written and clinically reviewed by Dr. Andrew Korcek, DDS, FAGD  ·  Korcek Dental, Minden, Nevada

Part of a larger guide

What to do in a dental emergency

Read the full guide →

Short answer

Pick the tooth up by the crown, never the root. Do not scrub it. Rinse briefly with milk or saline, put it back in the socket if you can, and bite gently on a cloth. If you cannot reinsert it, keep it in milk. Call (775) 782-9177 immediately. The first hour decides the outcome.

Do this, in this order

1

Find it and pick it up by the crown

The crown is the chewing surface. The root surface carries living cells that make reattachment possible, and touching or wiping them destroys the tooth's chance.

2

Do not scrub, and do not remove tissue fragments

Debris on the root looks like something to clean off. It is not. Leave it.

3

Rinse briefly if visibly dirty

Milk or sterile saline. Not tap water, which damages root cells, and not for more than a few seconds.

4

Reinsert it if you can

Back into the socket, the right way round, and bite softly on a clean cloth to hold it. The socket is the best storage medium there is.

5

If you cannot, store it in milk

Milk is the practical best option most households have. Saliva works. Water does not.

6

Call immediately

(775) 782-9177. Say the words knocked-out tooth.

Why the hour matters

The root is coated in periodontal ligament cells. Those cells are alive when the tooth leaves the mouth and they begin dying almost immediately once dry. Reimplantation succeeds when enough survive to reattach.

Dry time is the enemy, not elapsed time. A tooth kept moist for ninety minutes has a far better outlook than one that sat on a bathroom counter for twenty.

Baby teeth are different

Do not reinsert a knocked-out baby tooth. The developing permanent tooth sits directly above it and forcing the baby tooth back can damage it. Control the bleeding with gentle pressure and call us.

Common Questions

Quick answers

Save any fragments in milk and call. A fractured tooth can often be restored, and sometimes the fragment itself can be bonded back.
Ibuprofen rather than aspirin. Aspirin thins the blood and can make bleeding harder to control if treatment is needed.

Still have questions?

Talk to a person. We would rather answer a question than have you guess.

Call (775) 782-9177 Book an Appointment