Quick answer: If an adult tooth is knocked out, pick it up by the crown (never the root), rinse it gently with milk or saline if dirty, and try to place it back in the socket. If you cannot, store it in milk or saliva, not water, and see a dentist within 30 minutes. Acting fast gives the best chance of saving the tooth. In North York, call Keele & Sheppard Dentistry at 416-398-7460 right away.
A knocked-out, or avulsed, tooth is one of the few dental emergencies where the clock genuinely decides the outcome. The periodontal ligament cells on the root surface start to die within minutes of the tooth leaving the socket, and once they are gone, the tooth is much harder to save. The good news: handled correctly in the first half hour, a permanent tooth can often be successfully replanted.
Why Time Matters So Much
According to the International Association of Dental Traumatology (IADT), the best results come when a permanent tooth is replanted within about 30 minutes. Research on replanted teeth shows that survival is significantly higher when the tooth is back in the socket within an hour. Two factors decide the outcome: how long the tooth is out of the mouth, and how it is stored during that time.
Emergency Steps for a Knocked-Out Adult Tooth
- Stay calm and find the tooth. Handle it as little as possible.
- Pick it up by the crown, the white chewing part. Never touch the root.
- Rinse gently if dirty, using milk, saline, or even saliva for a few seconds. Do not scrub, do not use soap, and do not remove any attached tissue.
- Reinsert it if you can. Place the tooth back in the socket the right way around and bite softly on clean gauze or a cloth to hold it.
- If you cannot reinsert it, store it properly. Place the tooth in a container of milk, or hold it inside your cheek (for an adult who will not swallow it). Saline or a tooth-preservation kit also work.
- Get to a dentist immediately, ideally within 30 minutes. Bring the tooth with you.
What Not to Do
- Do not store the tooth in plain water. Water damages the delicate root cells quickly.
- Do not scrub the root or wrap the tooth in a dry tissue.
- Do not hold the tooth by the root.
- Do not try to replant a child’s baby (primary) tooth. Replanting a primary tooth can damage the developing permanent tooth underneath. Still see a dentist to check the area.
The Best Storage Options, Ranked
If you cannot put the tooth back right away, the storage medium matters:
- Best: a tooth-preservation kit (balanced salt solution) if available
- Excellent and usually on hand: cold milk
- Good: the person’s own saliva (inside the cheek) or saline
- Never: plain water
Adult Tooth vs Baby Tooth
Only permanent (adult) teeth should be replanted. If a child knocks out a baby tooth, do not put it back. Control any bleeding, comfort the child, and call a dentist to make sure no fragments remain and the permanent tooth bud is not affected.
What the Dentist Will Do
At the office, the dentist will reposition and splint the tooth to the neighbouring teeth so it can stabilize, usually for one to two weeks. A root canal is often needed within a week or two to prevent infection, depending on the tooth and how long it was out. Follow-up visits track healing and watch for complications such as root resorption.
Can a Knocked-Out Tooth Still Be Saved Hours Later?
The odds are best within the first 30 to 60 minutes, but teeth stored correctly in milk or saliva have occasionally been saved after much longer. Never assume it is too late. Bring the tooth and get to a dentist as fast as you can.
Prevent the Next One
A custom-fitted mouthguard is the single most effective way to prevent knocked-out and broken teeth during contact sports. The IADT also offers a free “ToothSOS” app with step-by-step instructions worth keeping on your phone if you have active kids.
Emergency Tooth Care in North York
Keele & Sheppard Dentistry prioritizes knocked-out teeth as time-critical emergencies and holds same-day slots whenever possible.
Call 416-398-7460 · Location 3-2800 Keele Street, North York, ON M3M 0B8
See the full guide to Emergency Dental Care in North York, and learn about emergency dental costs.
Frequently Asked Questions
Q1.How long do I have to save a knocked-out tooth?
The best window is within 30 minutes, and chances drop after an hour out of the socket. If you can store the tooth properly in milk or saliva, it may still be saveable for longer, so always bring it to the dentist quickly rather than giving up.
Q2. Can I put a knocked-out tooth back in myself?
Yes, for an adult tooth this is encouraged. Hold it by the crown, rinse gently with milk or saline, and slot it back into the socket the right way around, then bite on gauze. If it will not go in easily, store it in milk and see a dentist immediately.
Q3. Why milk and not water for a knocked-out tooth?
Milk has a balanced composition that helps keep the root’s living cells alive, while plain water causes those cells to swell and die quickly. If milk is not available, the person’s own saliva or saline is a better choice than water.
Q4. What if my child knocks out a baby tooth?
Do not try to put a baby tooth back, as replanting it can harm the permanent tooth developing underneath. Control bleeding, comfort your child, and contact a dentist to check the area and rule out any remaining fragments.
Q5. Will I need a root canal after replantation?
Often, yes. Adult teeth that have been out of the socket usually need a root canal within one to two weeks of replantation to prevent infection and improve the chances of keeping the tooth long term. Your dentist will advise based on your specific case.
