The call usually comes from a playground or a trampoline park. The parent on the line is holding a tooth in a napkin in one hand and a crying child in the other arm.

A knocked out tooth is the one dental emergency where what you do in the next half hour decides whether that tooth has a future. And the right move depends on one question: baby tooth or adult tooth?

Read this once now, while nobody is bleeding, so you know the answer when it counts. Maybe screenshot the summary at the bottom. Future you, standing in a parking lot, will be grateful.

Knocked out tooth: what to do if it’s an adult tooth

Pick it up by the crown, rinse it briefly in milk, put it back in the socket if you can (or keep it in cold milk), and get to a dentist within 30 minutes.

Now the details, because each step has a reason.

Hold the crown, never the root. The crown is the white part you normally see. The root is coated in living ligament cells that let the tooth reattach to bone. If they get scrubbed off or dry out, the tooth is a dead peg.

Rinse gently, if at all. If it’s dirty, rinse it for a few seconds in milk or saline (cold tap water if that’s all you have). No wiping and no scrubbing.

Put it back. This is the part parents hesitate on, and it’s the most effective thing you can do. Line it up with its neighbors and push it gently into the socket, then have your child bite softly on a cloth to hold it.

If you can’t, keep it wet the right way. Submerge it in cold milk, or tuck it in the cheek of an older child who won’t swallow it. A tooth-saving kit like Save-A-Tooth (a balanced salt solution some coaches keep) is great too.

Skip plain water for storage. It’s hypotonic, which means it pulls water into the ligament cells until they pop, within minutes.

The best save I’ve been part of started at a youth soccer game. A twelve-year-old took a knee to the mouth going up for a header, and his mom found his front tooth in the grass, held it by the crown, rinsed it with milk from the snack-table carton and pushed it back into the socket while he yelled at her. They were in my chair 25 minutes later. I straightened it and splinted it, and that tooth is still in his smile.

How long do you have to save a knocked out tooth?

About 30 minutes dry, and up to an hour in milk. That’s how long the ligament cells survive, and the International Association of Dental Traumatology guidelines put the best odds inside that window.

Now move. Call the dentist from the car. After hours, an ER can page one.

A tooth replanted at 20 minutes has a good chance of staying for decades. The same tooth replanted at three hours is usually there to buy time.

Milk is the best first-aid kit most families already own.

What if a baby tooth gets knocked out?

Don’t put it back. This is exactly why the baby-or-adult question comes first.

The adult tooth is developing in the bone right above the baby tooth’s root. Pushing a baby tooth back into its socket can damage that developing tooth, or fuse the baby tooth to the bone so it never falls out on schedule.

Leave it out and press a cold, damp cloth on the gum to slow the bleeding.

Call your dentist the same day. I’ll want an image to confirm the root came out whole and the adult tooth underneath is untouched.

Most children lose a front baby tooth this way without long-term trouble. Toddlers and coffee tables have a long, complicated history.

What about a chipped tooth?

A chipped tooth in a child is far more common than a knocked out one, and the fix is often better than you expect. Find the fragment and drop it in milk; a clean piece can often be bonded back on, which looks better than any filling.

Hold a cold compress on the lip. Then look for a pink dot in the center of the break. That means the nerve is exposed, and the tooth needs to be seen today.

A tooth pushed sideways or up into the gum counts as a dental emergency too, and so does a bite that suddenly doesn’t fit.

And every child in a sport with a ball or a stick in it needs a mouthguard. A custom one from your dentist fits better and gets worn more, and a boil-and-bite beats nothing.

Check the head before the mouth

Whatever happened to the tooth, check the child.

A hit hard enough to remove a tooth is hard enough to shake a brain. Watch for vomiting or unusual sleepiness, and treat those as the priority over anything dental. Head first, teeth second.

The long road after a replant

Even a perfect replant comes with homework.

A tooth replanted within minutes still needs a splint for a couple of weeks. In most fully grown teeth, it also needs a root canal soon after, because the nerve inside rarely survives the disconnection.

Some replanted teeth fuse to the bone or slowly resorb over the following years. Follow-up visits are where those problems get caught early. The emergency visit is chapter one of the story.

Save this for the parking lot

Adult tooth out: pick it up by the crown, rinse briefly, put it back or keep it in milk, and get to a dentist within 30 minutes. Baby tooth out: leave it out and call the same day. Chipped tooth: save the piece in milk and get it looked at. And after any hard hit, check the head before the mouth.

Quick questions parents ask

Can a knocked out tooth be saved after an hour? Sometimes it can still go back in, but the odds drop fast once the ligament cells die, which happens in about 30 minutes dry or up to an hour in milk. A late replant is usually there to buy time. Still bring the tooth. Your dentist decides.

Why do you put a knocked out tooth in milk? Milk is close to the body’s own fluids in salt balance, so it keeps the ligament cells on the root alive longer. Plain water is hypotonic and makes those cells swell and burst within minutes. Cold milk or a balanced salt solution like Save-A-Tooth are the two best options.

Should I go to the ER or the dentist for a knocked out tooth? Call your dentist first, from the car. After hours, an ER can page a dentist on call. Go straight to the ER if your child vomits, seems unusually sleepy or confused, or has a hit to the head that worries you. The brain comes before the tooth, every time.

Will a knocked out baby tooth hurt the adult tooth? Usually not, as long as nobody pushes the baby tooth back in. The adult tooth sits in the bone just above the baby tooth’s root, which is why I want an image after the accident to confirm the root came out whole and the adult tooth is untouched.

Dr. Staci Whitman, DMD, FMCP, is a board-certified dentist and is certified in functional medicine. She is based in Portland, Oregon and is the author of SPIT (Crown, 2027).

‍