Knocked a tooth out? Act within 30 minutes. Pick it up by the white crown (never the root), rinse it gently with milk, and push it back into the socket. Can't replant it? Drop it in a cup of milk — not water — and get to a dentist now. That's the whole emergency in three moves; everything below explains why each one matters.

A knocked-out (avulsed) tooth is one of the only true dental emergencies, and a World Cup summer — when millions of new and amateur players hit the pitch across the US, Mexico and beyond — is exactly when these injuries climb. Here's the practical truth most guides bury: the panicked reflex to rinse the tooth under the tap and drop it in water is the single most damaging thing you can do — water kills the very cells that let a tooth reattach. Get that one decision right and you've done the hardest part.

How long do you have to save a knocked-out tooth?

Short answer: about 30 minutes of dry time. According to the International Association of Dental Traumatology (IADT) avulsion guidelines (Dental Traumatology, 2020), after roughly 30 minutes of extra-alveolar dry time most periodontal ligament (PDL) cells — the root-surface cells that reattach the tooth to bone — become non-viable . The clock is the enemy; a storage medium buys time.

Citable line: According to the International Association of Dental Traumatology (2020), most periodontal ligament cells on an avulsed tooth become non-viable after about 30 minutes of dry time.

Step-by-step first aid for a knocked-out permanent tooth

This sequence follows the IADT and Academy for Sports Dentistry first-aid guidance [VERIFY_NEEDED：核对 IADT/ASD First Aid Part 10, 2024].

What's the best thing to store a tooth in?

Cold milk, if you have nothing better. A systematic review of tooth-storage media found milk preserves PDL cell viability better than saline or tap water; Hank's balanced salt solution (HBSS), propolis and oral rehydration salts also work [VERIFY_NEEDED：核对系统综述 PubMed 32344468].

Does milk really work after a long delay?

Faster is always better — but never give up on a tooth. A published case report documented a maxillary incisor replanted after 12 hours in milk, healthy at three-year follow-up [VERIFY_NEEDED：核对 case report]. Bring the tooth to the dentist even if time has passed.

What about a chipped tooth?

Find the fragments, store them in milk, and see a dentist fast. Chips are often rebuilt invisibly with composite bonding cured by an LED light — and the same handpieces used to clean and sterilize a handpiece keep that equipment safe between patients .

How to prevent it

The best emergency never happens. A properly fitted mouthguard cuts orofacial trauma, and every team should carry a pitchside emergency dental kit 

FAQ

Can a knocked-out tooth be put back in? Yes — a permanent tooth, ideally within 30 minutes. Baby teeth should not be replanted.

Should I put it in water? No. Use milk, saline, or saliva.

What if it's dirty? Rinse gently with milk for a few seconds — never scrub.

This article is for general educational purposes and is not a substitute for professional dental advice. In a dental emergency, contact a dentist immediately.