Dental emergencies
A Knocked-Out Permanent Tooth: What to Do in the First 30 Minutes
Published · Happy Smiles of Fort Myers (historical practice and dental education website)
For a knocked-out permanent tooth, minutes matter. Check the person first, handle the tooth by the crown, rinse it briefly, replant it or keep it moist in milk, and get to a dentist right away. Baby teeth are never put back in.
A tooth that has been completely knocked out of its socket is called an avulsed tooth. It is one of the few true dental emergencies where what happens in the first half hour can change the long-term result. The root surface is covered with delicate living cells, and those cells begin to die quickly once they dry out.
This guide walks through the first 30 minutes in order. It is general first-aid education and does not replace emergency medical or dental care. When in doubt, get help fast.
Step 1: Check the person before the tooth
A blow hard enough to knock out a tooth can also injure the head, neck, or jaw. Look after the person first. A tooth can wait a few minutes; a serious head injury cannot.
Call 911 or go to an emergency room immediately for loss of consciousness (even briefly), confusion, repeated vomiting, severe headache, neck pain, trouble breathing or swallowing, bleeding that will not stop with firm pressure, or an obviously broken jaw. Emergency medical care comes first; bring the tooth along in milk.
Step 2: Is it a baby tooth or a permanent tooth?
This is the most important question. Baby (primary) teeth should never be put back into the socket. Replanting a baby tooth can damage the permanent tooth developing underneath it. If a young child knocks out a baby tooth, control bleeding with gentle pressure on clean gauze and contact a dentist for advice; do not try to reinsert it.
As a rough guide, children usually have only baby teeth until about age 6, and the front permanent teeth come in between roughly ages 6 and 8. Ages overlap, and a mix of baby and permanent teeth is normal in between. If you are not sure which kind of tooth it is, do not reinsert it. Keep it moist in milk and get to a dentist or emergency service right away; a professional can tell the difference.
Step 3: Find the tooth and handle it by the crown
Pick the tooth up by the crown, the white chewing or biting part that normally shows in the mouth. Do not touch the root, the longer part that sits in the gum. Avoid wiping or scrubbing it, because that removes the cells the tooth needs to reattach.
Step 4: Rinse only if dirty, and only briefly
If the tooth is dirty, rinse it gently for a few seconds with milk, saline, or cool water. Do not use soap or chemicals, do not scrub, and do not wrap it in tissue or cloth, which dries it out and can strip the root surface.
Step 5: Replant if it is a permanent tooth and it is safe
The AAE advises that, for a permanent tooth, the best chance of saving it is to put it back in the socket as soon as possible. Hold it by the crown, make sure it faces the right way, and gently push it into place. Then have the person bite down softly on clean gauze, a handkerchief, or a moist tea bag to hold it while you travel to the dentist.
Do not force it. Replanting is not safe or appropriate for everyone, and it is fine to skip this step when:
- the tooth is, or might be, a baby tooth;
- the person is a young child, is distressed, or cannot cooperate;
- the person is drowsy, confused, or has any sign of head injury, or could choke;
- the socket or jaw appears badly damaged, or the tooth will not go in with gentle pressure.
If you cannot safely put the tooth back, do not worry about it. Keep the tooth moist (Step 6) and seek emergency dental help right away.
Step 6: If it cannot go back in, keep it moist
A tooth that dries out has a much lower chance of survival. The aim is to keep the root cells alive until a dentist can see it.
- Best: a tooth preservation kit with a balanced salt solution, if one is available (some schools, sports teams, and first-aid kits carry them).
- Very good and widely available: cold milk in a small, clean container.
- For an alert, cooperative adult or older teen: holding the tooth inside the mouth between cheek and gum. Never do this with a young child, who could swallow or inhale it.
- Avoid plain tap water for storage; it is fine for a quick rinse, but it damages root cells over time.
- Never let the tooth dry or wrap it in tissue.
Step 7: Get an emergency dental assessment within 30 minutes if possible
Contact a dentist or emergency dental service immediately and explain that a permanent tooth has been knocked out. Ideally the tooth is replanted or seen by a dentist within 30 minutes. Do not give up if more time has passed; go anyway, because treatment options still exist.
At the visit the dentist will typically check the socket and neighboring teeth, take X-rays, reposition the tooth if needed, and stabilize it with a flexible splint for a short period. Many replanted teeth later need root canal treatment, and the dentist will plan follow-up visits to watch healing over months. Ask whether a tetanus booster is needed, especially if the injury happened outdoors or the tooth touched soil.
Before it happens: practical preparation
- Children and adults in contact sports should wear a properly fitted mouthguard.
- Coaches, school staff, and families can keep a tooth preservation kit in the first-aid bag.
- Save your dentist's after-hours instructions in your phone so you are not searching during an emergency.
Sources
General education only. This article is not a diagnosis or a substitute for an exam by a licensed dentist. This website does not offer appointments or dental care.