In brief
If a permanent tooth is knocked out: pick it up by the crown (the white chewing part), never the root; if dirty, rinse it briefly with milk or water without scrubbing; if possible, place it gently back into its socket and hold it there; if not, keep it in milk or tucked inside the cheek; and get to a dental office immediately. The best chance of saving the tooth is within the first 30 to 60 minutes. Do not reinsert a baby tooth — for children with baby teeth, keep the tooth out and see a dentist promptly.
Key takeaways
- Handle the tooth only by the crown — touching the root damages the cells that allow reattachment.
- Rinse briefly if dirty; never scrub, wrap in tissue or let the tooth dry out.
- Reinserting the tooth into its socket immediately gives the best odds.
- Milk is the best common storage liquid; plain water is a last resort.
Step by step
1. Find the tooth and pick it up by the crown. The root surface is covered in delicate living cells that the tooth needs to reattach. Fingers on the root, scrubbing, or drying destroy them.
2. Rinse only if dirty. A few seconds under milk or cool water is enough. No soap, no scrubbing, no wrapping in tissue or cloth — dry storage is one of the fastest ways to lose the tooth.
3. Try to replant it. Facing the right way, ease the tooth back into its socket with gentle pressure, then keep it in place by biting softly on a clean cloth or gauze. Replantation within minutes gives the highest success rates. If it will not seat easily, do not force it.
4. Otherwise, keep it moist. Cold milk is the best readily available option. An older, calm child or adult can hold the tooth inside the cheek, bathed in saliva. Water is a last resort — better than dry, worse than milk. Do not store the tooth in ice.
5. Get to a dentist immediately. Call the clinic on the way so the team can prepare through their emergency dentistry process. The dentist will reposition and splint the tooth, and follow-up treatment — often including root canal treatment later — monitors healing.
Why time matters so much
The cells on the root surface begin dying as soon as the tooth dries. Replanted within about 30 minutes with a moist, undamaged root, teeth frequently reattach successfully; after an hour dry, the odds drop steeply. This is one of the few dental situations where the outcome is decided largely by what happens before you reach the clinic — which is what makes it a defining example of what counts as a dental emergency.
Baby teeth are different
Never reinsert a knocked-out baby tooth. Pushing it back can damage the permanent tooth developing in the bone underneath. Instead, control bleeding with gentle pressure, comfort the child, and contact a dentist promptly to check for socket damage and other injuries.
If the tooth cannot be saved
Sometimes a tooth is lost despite perfect first aid, or is too damaged to replant. When the site has healed, replacement options — implant, bridge or partial denture — can be discussed calmly, as outlined in options for replacing one missing tooth. Losing the tooth is not the end of the story.
When broader injuries are involved
A blow hard enough to knock out a tooth can injure more than the tooth. Seek emergency medical care first for any loss of consciousness, confusion, suspected jaw fracture or serious facial wounds — the decision logic is covered in emergency dentist or hospital.
Call 911 or seek emergency medical care for trouble breathing, trouble swallowing, uncontrolled bleeding, major facial trauma or other potentially life-threatening symptoms.
When to contact a dentist
Immediately — this is the one dental injury where calling on the way, rather than waiting to see how it feels, is always the right move. Even if the tooth was replanted successfully on the spot, it must be examined, splinted and monitored.
Contact the clinic
If a tooth has been knocked out or injured, contact York Street Dental Centre immediately for guidance on the next appropriate step.
Frequently asked questions
The tooth was dry for over an hour. Is it hopeless?
Not automatically. Success rates fall considerably, but a dentist may still attempt replantation depending on the situation. Bring the tooth in milk regardless — the final judgment belongs to the examining dentist.
Does replanting a tooth hurt?
The area is usually numbed before the tooth is repositioned and splinted. Discomfort afterward is typically manageable with standard pain relief.
Will a replanted tooth need more treatment?
Usually yes. Most replanted adult teeth eventually need root canal treatment because the nerve does not survive the injury, and the tooth is monitored over months to confirm the root is healing properly.
What if I cannot find the tooth?
Seek care anyway. The dentist needs to check the socket, rule out fragments in the lips or soft tissue, and confirm the tooth was not pushed into the gum — an X-ray answers these questions.
Sources
- American Association of Endodontists — Knocked-Out Tooth
- Canadian Dental Association — Dental Emergencies
- Cleveland Clinic — Avulsed (Knocked-Out) Tooth
This content is intended for general educational purposes and does not replace an examination, diagnosis or personalized treatment recommendation from a dental professional.