A foul ball, an elbow in basketball, a cleat to the face in soccer. The tooth is on the ground. The window for saving it is 30 minutes from impact to dentist’s chair, and the things you do in those 30 minutes matter.
This is the protocol. Background dental information lives in dental-trauma references; the protocol below is what you do.
Find the tooth. Look for it. On the field, in the helmet, in the kid’s mouth, on the dirt around them. If you find it, the next steps matter. If you cannot find it, the kid still needs the dentist, but the recovery picture is different.
Pick it up by the crown. The crown is the white part. The root is the yellowish part with the cells that hold the tooth in the socket. Touching, scrubbing, or wiping the root damages those cells. Pick up by the crown only.
Rinse gently. If the tooth is visibly dirty, a quick rinse with cold water or milk is fine. Hold the crown and let the liquid run over it. Do not scrub. Do not soap. Do not dry. Do not wrap in tissue (the root cells dehydrate and die fast).
Try to reimplant. This is the move that saves the tooth and most parents do not realize is the right move. If the tooth is a permanent tooth (not baby), aim it the right way and push gently into the empty socket with steady pressure. The kid bites down on a clean cloth to hold it in place during transport.
If reimplantation is not possible (kid uncooperative, broken bone in the way, you are unsure which way is up), move to storage.
Storage if you cannot reimplant. The order of preference:
Milk. Cold milk is the best widely-available storage medium. The pH and ionic balance keep root cells alive longer than water.
The kid’s saliva, in their own cheek. Only if the kid is old enough to not swallow the tooth (roughly 10+).
Hank’s Balanced Salt Solution (HBSS), found in Save-A-Tooth kits. Available at pharmacies for about $20. Some sports first-aid kits include them. Best storage medium per published research.
Saline solution if available.
What does not work: water (root cells die in plain water within 30 minutes), wrapping in tissue or paper towel (dehydrates the root), milk that has been sitting out warm for hours.
Get to a dentist within 30 minutes. Reimplantation success rates from published dental-trauma research:
Reimplanted within 5 minutes: about 85 percent retention rate at one year.
Within 15 minutes: about 70 percent.
Within 30 minutes: about 50 percent.
After 60 minutes: drops sharply, under 20 percent.
Call the dentist on the way. If your dentist is unavailable, ER. Most ERs have an on-call oral surgeon for emergencies.
Baby teeth are different. A knocked-out baby tooth (deciduous tooth) is generally not reimplanted. The American Academy of Pediatric Dentistry is direct on this: pushing a baby tooth back into the socket can damage the developing permanent tooth above it.
The kid still needs to see the dentist, but quickly is fine, not 30 minutes. The dentist will assess the socket, the surrounding bone, and the developing tooth above.
How to tell baby vs permanent: roughly age. Most central incisors (front teeth) are baby until age 6 to 7, then permanent. Permanent teeth are larger and have more pronounced roots than baby teeth. If you cannot tell, get the kid to a dentist with the tooth and let them assess.
When the ER comes first. If the kid has significant facial trauma, possible jaw fracture, head injury with concussion signs, or bleeding that does not stop, the ER comes first. Bring the tooth (in milk or saline) but the priority is the kid.
Mouthguards prevent most of this. This is worth saying. The kid wearing a properly fitted mouthguard is not the kid who loses a tooth on a routine collision. The kid without one is.
The conversation, calm. If your kid is the one with the missing tooth, they will be panicked. Your tone matters. The protocol is short, the window is real, and panic makes for worse decisions. Calm voice, fast moves, dentist within 30 minutes. The tooth might be saved.
The honest read. Knocked-out teeth in youth sports are usually saveable when the protocol is followed. The most common failure is not saving the tooth in the wrong medium (water, tissue) or waiting too long. Get the tooth in milk, get the kid in the car, get to a dentist. Thirty minutes.