Knocked-Out Tooth? What to Do in the First 30 Minutes

A knocked-out permanent tooth is one of the few true dental emergencies where minutes matter. The tooth itself is fine. What is at risk is the thin layer of living cells on the root that reattaches it to the bone. Those cells start dying as soon as the root dries out. Keep them alive and get to a dentist fast, and there is a real chance of keeping your own tooth for years.

Step 1: Find the Tooth and Handle It Correctly

Pick the tooth up by the chewing surface or the white part you normally see when someone smiles. Avoid touching the root. The root surface is covered in delicate tissue fibers, and squeezing, rubbing, or wiping it can destroy the cells that need to reattach.

If the tooth fell onto dirt, grass, or pavement, rinse it gently for no more than about ten seconds. Milk or saline is best. Plain tap water is acceptable for a quick rinse only. Do not use soap, alcohol, or mouthwash, do not scrub it with a towel, and do not let it sit in a tissue to dry.

Step 2: Put It Back in If You Can

The single best place for a knocked-out adult tooth is back in its own socket. Studies on tooth avulsion consistently show the best outcomes when the tooth is replanted within the first few minutes.

• Make sure the tooth is facing the right way. The front of the tooth faces the lips.
• Gently push it into the socket with your fingers until it sits level with the teeth beside it.
• Bite softly on a clean cloth or gauze to hold it in place.
• Head to the dentist right away, even if it feels secure. Our emergency dentistry page has both office numbers.

Do not force it. If it will not go back in easily, if the person is very young, unconscious, or upset, or if there is a lot of bleeding or other injury, skip this step and store the tooth instead.

Step 3: If It Will Not Go Back In, Store It Right

The goal is to keep the root moist and the cells alive. Here is how storage options rank, from best to worst:

• A tooth preservation kit. Products made for this purpose use a balanced salt solution that keeps root cells alive for hours. They are inexpensive and worth keeping in a sports bag or first aid kit.
• Cold milk. The most practical option for most families. Put the tooth in a small cup or zip bag of milk and bring it with you.
• Saliva. An older child or adult can hold the tooth inside the cheek, as long as there is no risk of swallowing it. Spitting into a small container and placing the tooth in it also works.
• Saline or contact lens solution. Better than nothing for a short time.

Avoid storing the tooth in plain water for long. Water slowly damages the root cells. And never let the tooth dry out in a napkin, pocket, or plastic bag with no liquid.

What We Do When You Arrive

When you call either office and tell us a tooth was knocked out, we treat it as a priority. At the visit we will typically:

• Clean the area and check the socket and surrounding bone with x-rays.
• Replant the tooth if it is not already back in, or check the position if you replanted it.
• Attach a flexible splint to the neighboring teeth to hold it steady, usually for about two weeks.
• Check for other injuries to the lips, gums, and nearby teeth.
• Plan follow-up care. Fully developed adult teeth that have been knocked out almost always need a root canal within the next week or two, because the nerve inside does not survive the injury.

You may also be told to eat soft foods, brush gently, and use a prescribed rinse while it heals. If the injury happened outdoors and your tetanus shot is not current, check in with your physician.

Baby Teeth Are Different

Never put a knocked-out baby tooth back in. Replanting a primary tooth can damage the adult tooth developing just underneath it. Keep your child calm, control bleeding with gentle pressure on gauze, and call us so we can check the area and the permanent tooth. Bring the tooth along if you found it, so we know nothing is still lodged in the gums. Our pediatric dental team sees these injuries often, especially in toddlers who are just learning to walk.

If the Tooth Cannot Be Saved

Sometimes the tooth is lost, cracked through the root, or was dry too long to heal. There are still good options. A dental implant is often the best long-term replacement for a single front tooth in an adult, and a dental bridge can work in other cases. For teenagers whose jaws are still growing, we often use a temporary replacement until an implant is possible.

Prevention Is Easier Than Replanting

Most knocked-out teeth happen during sports, falls, and horseplay. A properly fitted mouthguard is the single best protection for kids and adults who play football, basketball, baseball, soccer, or wrestle, and for anyone who rides ATVs or mountain bikes on East Tennessee trails. Learn more in our guide to sports mouthguards.

Common Questions

How long can a knocked-out tooth survive outside the mouth?

The best results come when the tooth is put back within about five minutes. If it is kept moist in milk, saliva, or a tooth preservation solution, it may still be saved if you see a dentist within an hour. A tooth that has been dry for more than about an hour has a much lower chance of long-term survival.

Should I put a knocked-out tooth in water?

Only for a quick rinse of a few seconds if it is dirty. Plain water damages the root cells over time. Cold milk, saliva, or a tooth preservation kit are much better for storing the tooth on the way to the dentist.

Should I put a knocked-out baby tooth back in?

No. Never replant a baby tooth, because it can damage the permanent tooth developing underneath. Control the bleeding with gentle pressure and call your dentist to have the area checked.