Quick answer: Pick the tooth up by the crown, never the root, rinse it gently for no more than 10 seconds if dirty, and try to reinsert it into the socket immediately. If that’s not possible, keep it moist in milk or your own saliva and get to a dentist within 30 minutes for the best chance of saving it, and within an hour at the outside.
A knocked-out tooth is one of the few dental emergencies where the next few minutes genuinely decide the outcome. Here’s exactly what to do, in order, without wasting the time that matters most.
Step 1: Find the tooth and pick it up correctly
Locate the tooth immediately, don’t leave it at the scene. Pick it up by the crown, the white chewing surface, never by the root. The root surface is covered in delicate cells that are essential for successful reimplantation, and touching, scrubbing or damaging them significantly reduces the chance the tooth can be saved.
Step 2: Check whether it’s dirty, and rinse only if needed
If the tooth has visible dirt or debris, rinse it gently with lukewarm water for no more than 10 seconds. Don’t scrub it, don’t use soap or any chemical, and don’t wrap it in tissue or cloth, all of these damage the root surface further. If it’s not visibly dirty, skip this step entirely and move straight to reinsertion.
Step 3: Try to put it back in the socket immediately
This is the single most important step, and the one people are often too afraid to attempt. Gently push the tooth back into its socket, facing the right way round, using firm but gentle pressure. Bite down softly on a clean cloth, gauze, or even a folded tissue to hold it in place. Reimplanting within 5 minutes gives the tooth the best possible chance of long-term survival, so don’t wait until you reach a dentist to attempt this if it’s physically possible.
Step 4: If you can’t reinsert it, keep it moist, not dry
If reinsertion isn’t possible, either because it’s too painful, the socket is damaged, or you simply can’t manage it, the priority shifts to keeping the tooth moist at all times. The best options, in order of preference:
- Milk — genuinely one of the best storage options available, since it’s gentle on the root cells
- Your own saliva — hold the tooth inside your cheek (not in a young child’s mouth, due to the risk of swallowing it)
- An emergency tooth preservation kit, if you happen to have one
- Water, only as a last resort — tap water can damage the root cells if the tooth sits in it for an extended period, so use this only if nothing else is available
Never let the tooth dry out. A dry tooth loses viability far faster than one kept moist, even briefly.
Step 5: Get to a dentist as fast as possible, ideally within 30 minutes
Time is genuinely the deciding factor here. A tooth reimplanted within 30 minutes has the best outlook. Even up to an hour, there’s still a real chance of success, but the odds decline the longer the tooth is out of the mouth. Call your dentist on the way if you can, so the team can prepare for your arrival rather than you starting the process from scratch when you get there.
If it’s outside normal hours, contact our emergency dentist team directly rather than waiting until morning, every minute genuinely counts with this specific injury in a way it doesn’t with most other dental emergencies.
One important exception: baby teeth
Never reimplant a knocked-out baby tooth. Forcing a primary tooth back into the socket risks damaging the permanent tooth developing underneath it. If your child loses a baby tooth this way, call your dentist for guidance on managing the area rather than attempting reinsertion yourself.
What happens once you reach the dentist
Even a successfully reimplanted tooth needs follow-up care. Because the nerves and blood vessels are damaged when a tooth is knocked out, it will usually need a root canal at some point after reimplantation, along with splinting to adjacent teeth for one to two weeks while it stabilises. This isn’t a sign anything went wrong, it’s the standard, expected path for a reimplanted tooth. We’ve also covered the other common dental emergencies and how to respond to each if you want the fuller picture beyond this specific situation.
Not every knocked-out tooth can be saved long-term, even with perfect first aid, root resorption and other complications sometimes mean the tooth is eventually replaced with an implant or bridge instead. That outcome doesn’t reflect a mistake in how it was handled, some injuries are simply too severe for the tooth to survive regardless of the response.
Frequently asked questions
Can a knocked-out tooth always be saved? Not always, but fast, correct first aid significantly improves the odds. Reimplanting within 30 minutes gives the best chance, and success also depends on how the tooth was handled and the extent of the original injury.
What’s the best thing to store a knocked-out tooth in? Milk is one of the best options if you can’t reinsert the tooth straight away, since it’s gentle on the delicate root surface cells. Your own saliva is a good alternative. Avoid water except as a last resort, since it can damage the root cells over time.
Should I try to put the tooth back in myself? Yes, if you can manage it. Gently pushing the tooth back into its socket and biting down softly on gauze or a cloth to hold it is the single most effective first-aid step, and it’s safe to attempt before you reach a dentist.
Do knocked-out baby teeth need to be reimplanted? No. Never put a knocked-out baby tooth back into the socket, this can damage the developing permanent tooth underneath. Call a dentist for guidance instead.
Will a reimplanted tooth need a root canal? Usually, yes, at some point after reimplantation. The nerves and blood vessels are damaged when a tooth is knocked out and generally can’t be repaired, so a root canal is a standard, expected part of aftercare rather than a complication.
Every minute counts, don’t wait
If you or your child have just knocked out a tooth, act on the steps above immediately, then get in touch straight away.
Contact our emergency dentist team or call 01604 604545 right now. We’re a dental clinic in Northampton open Monday to Friday, 8:30am to 5:30pm, plus one Saturday a month, for exactly this kind of emergency.
Written by Dr Anesh Patel
Dentist, B.D.S. M.F.G.D.P. (UK)
Co-owner of Cliftonville Dental, Dr Anesh Patel qualified from Kings College London in 1999 and has practised in Northampton ever since, with a special interest in cosmetic and implant dentistry.
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