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dental-oral

Tooth Knocked Out: What to Do Right Now

A knocked-out permanent tooth is a dental emergency. Pick up the tooth by the crown, rinse gently if needed, and either reinsert it into the socket or store it in cold milk. Reach a dentist within 30 minutes — the sooner the tooth is reimplanted, the better the chance it can be saved. [1]

Step-by-step: what to do in the first minutes

Speed and proper handling are the two factors that most determine whether the tooth can be saved. 1

1. Find and pick up the tooth correctly. Handle the tooth by the crown — the white part visible in the mouth. Do not touch the root. The root surface carries periodontal ligament (PDL) cells that must survive for the tooth to reattach; touching or scrubbing the root destroys these cells.

2. Rinse gently if necessary. If the tooth is visibly dirty, hold it by the crown and rinse briefly under cold running water for no more than 10 seconds. Do not use soap, disinfectant, or a brush.

3. Reinsert the tooth if possible. For a permanent tooth in a cooperative adult or older child: gently push the tooth back into the socket, crown-first, and bite down softly on gauze or a clean cloth to hold it in place. This is the best possible storage: the socket maintains PDL cells far better than any external medium. 12

4. If reinsertion is not possible, keep it moist. Store the tooth in one of these, in order of preference: - Cold milk — whole or 2%; the most widely available medium with strong evidence for PDL cell preservation 2 - The person's own saliva — hold the tooth in the cheek pocket, or spit into a cup and submerge it - Hank's Balanced Salt Solution — an isotonic tissue-culture medium available at some pharmacies (the gold-standard storage medium when accessible) 2 - Saline — an acceptable alternative - Water — last resort only; it is not isotonic and is inferior to milk or saliva

Do not store the tooth dry, in dry tissue, or in alcohol.

5. Go immediately to a dentist or emergency room. The window for a good outcome is approximately 30–60 minutes. After two hours outside the socket, chances of successful reimplantation drop significantly. 1

Does this guidance apply to baby teeth?

The guidance above applies only to permanent (adult) teeth. Baby teeth (primary teeth) are generally not reimplanted — forcing a primary tooth back into the socket risks damaging the developing permanent tooth beneath it. 3

If a child's baby tooth is knocked out: control any bleeding with gentle pressure, calm the child, and see a dentist promptly for assessment. The dentist will determine whether a space-maintainer or other intervention is needed and will monitor the area.

What will the dentist do?

If you arrive promptly with the tooth stored properly, the dentist will:

  • Clean and examine the socket
  • Reimplant the tooth and splint it to adjacent teeth for several weeks to allow the surrounding tissue to stabilize 1
  • Assess whether the root is intact and whether root canal treatment will be needed
  • Monitor the tooth over subsequent weeks for signs of healing or complications

Root canal treatment is commonly required after reimplantation — the nerve inside the tooth typically does not survive the injury, and a root canal prevents internal infection that would eventually cause the tooth to fail. Even successfully reimplanted teeth may need additional management over the following years due to root resorption.

What if there is significant bleeding?

Apply firm but gentle pressure to the socket with a clean cloth or gauze for 10–15 minutes. Do not repeatedly lift the cloth to check — steady pressure allows a clot to form. Persistent bleeding after 20 minutes of firm pressure, any concern about the airway, or signs of head or neck injury warrant emergency room evaluation alongside the dental emergency.

Common questions

Is milk really the best thing to store a knocked-out tooth in?

Yes — a systematic review found milk to be among the best widely available storage media for preserving the periodontal ligament cells on the root surface. Whole or 2% milk is preferred. If milk is unavailable, the person's own saliva (cheek pocket or a cup) is the next best option. Hank's Balanced Salt Solution is the gold standard when accessible. Avoid dry storage, which destroys PDL cells within minutes.

What if I cannot reach a dentist — should I go to the ER?

Yes. A hospital emergency room can reimplant or temporarily stabilize a knocked-out tooth when a dentist is not immediately available. Bring the tooth stored in milk or saliva. Time matters more than venue — go to whichever facility you can reach fastest.

Will a reimplanted tooth last forever?

Not necessarily. Reimplanted teeth can develop complications over months or years, most notably root resorption (where the body gradually breaks down the root). Regular dental follow-up is essential. Even if the tooth is eventually lost, early reimplantation preserves bone and buys time to plan a permanent replacement.

Can I reinsert the tooth myself?

For a permanent tooth in an adult or cooperative older child, yes — gently pushing it back into the socket is the recommended first-aid step when professional care is not immediately available. Correct orientation (crown visible, root into the socket) and gentle pressure are what matter. Go directly to a dentist or ER afterward.

This is a dental emergency — act within 30 minutes

  • —Any tooth avulsion in a child — go immediately, do not reimplant baby teeth
  • —Significant uncontrolled bleeding from the socket after 20 minutes of firm pressure
  • —Head injury, loss of consciousness, confusion, or neck pain accompanying the tooth injury — these require emergency medical evaluation first
  • —Multiple missing or broken teeth suggesting significant facial trauma

If there is associated head injury, loss of consciousness, or difficulty breathing, call 911 immediately. For an isolated knocked-out tooth, go directly to the nearest available dentist or emergency room — do not wait.

This article provides general first-aid information for tooth avulsion. Always seek professional dental or emergency care as quickly as possible. First-aid steps here are not a substitute for professional evaluation and treatment.

References

  1. 1.Fouad AF, Abbott PV, Tsilingaridis G, Cohenca N, Lauridsen E, Bourguignon C, et al. (2020). International Association of Dental Traumatology guidelines for the management of traumatic dental injuries: 2. Avulsion of permanent teeth. Dental Traumatology. doi:10.1111/edt.12573 ✓IADT guidelines for avulsion management: handling by crown, 30–60 min replantation window, socket as best storage, splinting protocol, root canal indication
  2. 2.De Brier N, O D, Borra V, Singletary EM, Zideman DA, De Buck E; ILCOR First Aid Task Force (2020). Storage of an avulsed tooth prior to replantation: A systematic review and meta-analysis. Dental Traumatology. doi:10.1111/edt.12564 ✓Milk and Hank's Balanced Salt Solution preserve periodontal ligament cell viability better than tap water or dry storage
  3. 3.American Academy of Pediatrics (2014). Management of Dental Trauma in a Primary Care Setting. Pediatrics. link ✓Primary teeth (baby teeth) should not be reimplanted after avulsion due to risk of damage to the developing permanent tooth beneath

3 sources, numbered by first appearance. General health information, not medical advice — synthetic demonstration content.