Knocked-Out Tooth in Adults (Dental Avulsion)

Why the First 60 Minutes Matter

When a tooth is knocked out, the clock starts immediately. The delicate living fibers that attach the tooth root to the bone begin to die the moment the tooth leaves the socket — and after approximately 30 minutes of dry time outside the mouth, most of them are no longer viable.

Keeping the tooth moist from the moment of injury is critical. Placing it in an appropriate storage medium buys time, but does not stop the clock. The overall window to reach a dentist and have the tooth professionally replanted is approximately 30 to 60 minutes from the time of injury.

After 60 minutes of total time outside the mouth — whether dry or in a storage medium — the likelihood of long-term success drops sharply.

This is why the steps you take in the minutes before reaching a dentist have a direct impact on whether the tooth can be saved.

What to Do Immediately

Follow these steps in order, as quickly as possible.

1. Stay calm and find the tooth. Pick it up by the crown — the white part normally visible in the mouth. Never hold it by the root.
2. If the tooth is visibly dirty, rinse it briefly and gently under cold running water for no more than 10 seconds. Do not scrub it. Do not use soap.
3. Try to place the tooth back into the socket. Seat it gently with finger pressure and bite down softly on a clean cloth to hold it in place. This is the single best thing you can do before reaching a dentist.
4. If you cannot replant the tooth, keep it moist immediately. The best options are: submerge it in cold whole milk; tuck it between your cheek and gum; or store it in a small clean container of your own saliva. All three preserve the living fibers on the root surface until you reach professional care.
5. Call a dentist immediately and go straight there. Bring the tooth with you regardless of what condition it appears to be in.

Time is the most important factor. Do not delay for any reason.

What Not to Do

• Do not hold the tooth by the root
• Do not scrub, wipe, or dry the tooth
• Do not wrap the tooth in tissue or paper — this dries it out within minutes
• Do not store the tooth in tap water for any extended period — its low salt content damages the root fibers
• Do not delay getting to a dentist

How a Knocked-Out Tooth Is Treated

Treatment for adults with fully formed tooth roots follows a clear clinical path. The key variables are how quickly the tooth was recovered and how it was stored.

Replantation

If the tooth arrives in good condition within the critical window, the dentist will clean the socket, assess the surrounding tissue, and carefully replant the tooth. A soft, flexible splint is then attached to the neighboring teeth for approximately two weeks to stabilize it while the socket heals. A more rigid splint may be used for longer if there is an associated fracture of the surrounding bone.

A course of antibiotics is typically prescribed following replantation to reduce the risk of infection and support healing.

Root Canal Treatment

For adults with fully formed roots, root canal treatment is almost always required after replantation. This is because the pulp — the living tissue inside the tooth — does not survive the trauma, and leaving it untreated creates a significant infection risk.

Root canal treatment is typically initiated within 7 to 10 days of replantation, while the splint is still in place. Your dentist will refer you to a Specialist Endodontist and will let you know any required follow-up appointments.

Long-Term Monitoring

Replanted teeth require ongoing monitoring over months and years. Your dentist will assess healing through clinical examination and X-rays at regular intervals — typically at one month, three months, six months, one year, and annually for at least five years.

This is important because complications such as root resorption can develop gradually and may not be visible for some time after the injury. Early detection significantly improves the outcome.

When Replantation Is Not an Option

In some cases, replantation is not appropriate — for example, if the tooth has been out of the mouth for a long time without storage, if there is extensive root damage, or if certain medical conditions affect healing.

When replantation is not possible, tooth replacement becomes the focus. Options such as a dental implant or a bridge may be considered depending on your age, bone condition, and overall oral health. Your dentist will discuss these with you once the injury site has been assessed.

A Note for Teenagers and Young Adults

If you are a teenager or young adult whose permanent teeth are not yet fully developed, the treatment path after replantation differs in one important way.

In younger patients whose roots are still forming — what dentists call an open apex — root canal treatment is not automatically performed after replantation. Instead, the tooth is monitored closely to see whether its own blood supply recovers naturally, a process called revascularization. When this occurs, the root can continue to develop. Root canal treatment is only initiated if monitoring confirms that the pulp has not survived.

Your dentist will explain which situation applies to you and what the follow-up schedule will look like.

Can a Knocked-Out Tooth Be Prevented?

Not every avulsion is preventable, but the risk can be meaningfully reduced:

• Wear a custom-fitted mouthguard for contact sports and physical activity — this is the single most effective protection against dental trauma
• Wear a seatbelt consistently when in a vehicle
• Be cautious around slippery surfaces

A mouthguard custom-fitted by a dentist provides far better protection than any over-the-counter alternative. If you play contact sports regularly, ask your dentist about having one made.