A knocked-out permanent tooth can be saved by picking it up by the crown, rinsing it gently with milk or saline, and replanting it into the socket within 30 minutes of the injury. If replantation is not possible, the tooth should be stored in milk, saliva, or saline solution and transported with the patient to a dentist immediately. Primary (baby) teeth should not be replanted because doing so can damage the developing permanent tooth underneath.

Dental trauma accounts for roughly 5 percent of all injuries treated in emergency departments, and the American Dental Association identifies knocked-out teeth as one of the most time-sensitive dental emergencies. A permanent tooth that is replanted within 30 minutes has the best chance of long-term survival. After 60 minutes, the periodontal ligament cells on the root surface begin to die, and the success rate drops sharply. For patients in Gorham, Westbrook, Portland, Windham, Standish, and surrounding Cumberland County communities, knowing the correct first aid steps before reaching a dentist often determines whether a tooth can be saved.

This guide explains the step-by-step first aid for a knocked-out tooth, the difference between handling a permanent tooth and a baby tooth, what not to do at the scene, and the treatment a dentist performs to stabilize and monitor a replanted tooth. Emergency dentistry in Gorham covers the full range of urgent dental conditions, and what to do for a severe toothache explains how to manage tooth pain before reaching the dentist.

Key Takeaways

A knocked-out permanent tooth can be saved if replanted within 30 minutes and handled correctly at the scene.
Pick up the tooth by the crown, never the root, to preserve the periodontal ligament cells that allow reattachment.
Store the tooth in milk, saliva, or saline solution, never in water, which destroys the root surface cells.
Do not replant a baby tooth because doing so can damage the developing permanent tooth underneath.
See a dentist within 30 minutes for the best chance of long-term tooth survival.
Wear a mouthguard during contact sports to prevent most knocked-out tooth injuries.

Why Time Matters for a Knocked-Out Tooth

The periodontal ligament, a thin layer of connective tissue that attaches the tooth root to the jawbone, determines whether a knocked-out tooth can be saved. This ligament contains living cells that must remain hydrated and viable for replantation to succeed. When the tooth is outside the mouth, these cells begin to dry out and die within minutes.

Replantation within 30 minutes gives the periodontal ligament cells the best chance of survival. Between 30 and 60 minutes, the success rate declines. After 60 minutes, most of the ligament cells are nonviable, and the body treats the replanted tooth as a foreign object, leading to root resorption and eventual tooth loss. The storage medium matters as much as the time: milk, saliva, and saline solution preserve cell viability, while water causes the cells to swell and burst.

Time Outside Mouth	Storage Medium	Expected Outcome
Under 30 minutes	Replanted or milk/saline	Best chance of long-term survival
30 to 60 minutes	Milk, saliva, or saline	Moderate chance; root resorption possible
Over 60 minutes	Milk or saline (not water)	Lower success rate; extraction likely
Any time	Water	Root cells destroyed; tooth cannot be saved

Step-by-Step First Aid for a Knocked-Out Permanent Tooth

Correct handling at the scene preserves the tooth’s viability and improves the outcome of replantation. The following steps apply to permanent teeth only. Baby teeth require different handling, which is covered in the next section.

Step 1: Handle the Tooth by the Crown

The crown is the white part of the tooth that is normally visible above the gum line. Pick up the tooth by the crown and avoid touching the root surface. The root carries the periodontal ligament cells that must remain intact for reattachment. Touching or scraping the root damages these cells and reduces the chance of successful replantation.

Step 2: Rinse Gently with Milk or Saline

If the tooth is dirty, rinse it gently with milk or saline solution for no more than 10 seconds. Do not scrub the tooth, and do not use water. Water has a lower osmolarity than the root cells, which causes them to swell and burst. Milk and saline solution have an osmolarity close to that of the body, which preserves cell viability.

Step 3: Replant the Tooth If Possible

Replanting the tooth into the socket immediately is the best option if the patient is alert and cooperative. Insert the tooth into the socket with gentle pressure and have the patient bite down on a clean cloth or gauze to hold it in place. Do not force the tooth if it does not seat easily. If replantation is not possible, proceed to storage.

Step 4: Store the Tooth in Milk or Saliva

If the tooth cannot be replanted, place it in a container of milk, saliva, or saline solution. Milk is the preferred storage medium because it has the correct pH and osmolarity to preserve periodontal ligament cells. Saliva is an acceptable alternative if milk is not available. Do not store the tooth in water, and do not wrap it in a dry cloth or tissue.

Step 5: Control Bleeding and Manage Pain

Bleeding from the empty socket is normal and usually stops within a few minutes with gentle pressure. Have the patient bite down on a clean gauze pad or cloth for 10 to 15 minutes. Apply a cold compress to the outside of the face to reduce swelling. Over-the-counter pain relievers such as ibuprofen or acetaminophen can manage discomfort.

Step 6: Get to the Dentist Within 30 Minutes

Call the dentist immediately after stabilizing the patient and the tooth. Morgan Dental Care offers same-day emergency appointments and after-hours on-call support at (207) 839-2655. The dentist replants the tooth if it was not replanted at the scene, stabilizes it with a flexible splint, and schedules follow-up visits to monitor healing.

What to Do for a Knocked-Out Baby Tooth

A knocked-out baby tooth should not be replanted because doing so can damage the developing permanent tooth underneath. Primary teeth begin to resorb their roots naturally as the permanent tooth erupts, and replanting a primary tooth can disrupt this process. Instead, control bleeding with gauze, apply a cold compress, and call a dentist for guidance.

Parents should note that losing a baby tooth prematurely can affect speech development, chewing, and the alignment of permanent teeth. A pediatric dentist may recommend a space maintainer to hold the gap open until the permanent tooth erupts. This is a routine procedure that prevents crowding and reduces the need for orthodontic treatment later.

What Not to Do After Dental Trauma

Certain common first aid measures worsen the outcome of a knocked-out tooth. Avoiding these mistakes preserves the tooth’s viability and improves the chance of successful replantation.

Do not touch the root. The root surface carries the periodontal ligament cells that allow reattachment. Touching or scraping the root damages these cells.
Do not scrub the tooth. Scrubbing removes the ligament cells and makes replantation impossible.
Do not store the tooth in water. Water causes the root cells to swell and burst.
Do not wrap the tooth in a dry cloth or tissue. Drying kills the ligament cells within minutes.
Do not replant a baby tooth. Replanting a primary tooth can damage the developing permanent tooth underneath.
Do not delay dental care. Replantation within 30 minutes offers the best chance of saving the tooth.

What to Expect at the Emergency Dental Visit

An emergency dental visit for a knocked-out tooth focuses on replanting the tooth, stabilizing it, and monitoring the healing process. The dentist examines the socket, the tooth, and the surrounding bone to determine the appropriate treatment.

Examination and Imaging

The dentist examines the empty socket for bone fractures, checks the adjacent teeth for damage, and evaluates the patient for signs of jaw fracture or head injury. Dental X-rays and sometimes a cone beam CT scan show the condition of the socket and surrounding bone. The dentist also assesses the tooth itself for fractures or cracks that would prevent replantation.

Replantation and Splinting

The dentist cleans the tooth and socket with saline, replants the tooth with gentle pressure, and stabilizes it with a flexible splint. The splint is a thin wire or nylon line bonded to the adjacent teeth that holds the replanted tooth in position while the periodontal ligament heals. The splint typically remains in place for one to two weeks.

Follow-Up Care and Monitoring

The dentist schedules follow-up visits at two weeks, four weeks, three months, six months, and one year after replantation. At each visit, the dentist checks the tooth for mobility, signs of infection, and root resorption. A root canal treatment is often necessary within two weeks of replantation because the pulp blood supply is severed during avulsion. The tooth may require a dental crown if the crown fractures during the injury.

Long-Term Outcomes for Replanted Teeth

Replanted teeth can survive for many years with proper care, but the long-term prognosis depends on the time outside the mouth, the storage medium, and the condition of the root surface. Studies published in dental journals report that replanted teeth have a survival rate of roughly 80 to 90 percent at five years when replanted within 30 minutes, with survival declining as extraoral time increases.

Two complications affect replanted teeth: root resorption and ankylosis. Root resorption occurs when the body’s immune system attacks the root surface, gradually dissolving the root. Ankylosis occurs when the root fuses directly to the bone, preventing normal tooth movement and causing the tooth to appear lower than adjacent teeth over time. Regular dental visits allow the dentist to monitor for these complications and intervene early.

How to Prevent Knocked-Out Teeth

Preventive measures reduce the risk of dental trauma, especially for athletes and children. The American Dental Association recommends mouthguards for all contact sports including football, hockey, basketball, soccer, and lacrosse. A custom-fitted mouthguard from a dentist provides better protection than a stock mouthguard from a sporting goods store.

Wear a mouthguard during contact sports and recreational activities.
Wear a helmet during cycling, skating, and other activities that risk facial impact.
Childproof the home to reduce fall risks for young children.
Use seat belts to prevent facial injuries during car accidents.
Avoid running on slippery surfaces and use handrails on stairs.
Schedule regular dental checkups to catch conditions that weaken teeth.

Frequently Asked Questions

Can a knocked-out tooth be saved? A knocked-out permanent tooth can be saved if it is replanted within 30 minutes and handled correctly. Pick up the tooth by the crown, rinse gently with milk or saline, and replant it into the socket if possible. If you cannot replant it, store it in milk or saliva and call a dentist immediately.

What do you put a knocked-out tooth in? Place the tooth in milk, saliva, or saline solution. Milk is the preferred storage medium because it preserves the periodontal ligament cells. Do not put the tooth in water, which causes the root cells to swell and burst. Do not wrap the tooth in a dry cloth or tissue.

How long does it take for a knocked-out tooth to die? The periodontal ligament cells on the root surface begin to die within 15 to 20 minutes of being outside the mouth. Replantation within 30 minutes offers the best chance of long-term survival. After 60 minutes, the success rate drops significantly, and the tooth may not survive long term.

Should I put a knocked-out tooth in milk? Yes, milk is the best transport medium for a knocked-out tooth because it has the correct pH and osmolarity to preserve the periodontal ligament cells. If milk is not available, saliva or saline solution are acceptable alternatives. Do not use water.

What happens if you don’t replant a knocked-out tooth? If a knocked-out permanent tooth is not replanted, the socket heals with bone and gum tissue, and the tooth is lost. Replacement options include a dental implant, a dental bridge, or a partial denture. An implant is often the preferred option because it does not require altering adjacent teeth.

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About the Dentist

Dr. Brett Morgan and Dr. Tim Adamchuk provide emergency dental care at Morgan Dental Care, located at 94 Main Street in Gorham, Maine. The practice serves patients from Gorham, Westbrook, Portland, South Portland, Windham, Scarborough, Standish, Buxton, and surrounding Cumberland County communities. Morgan Dental Care offers same-day emergency appointments, after-hours on-call support, and a full range of restorative services including dental implants, dental crowns, and dental extractions.

Morgan Dental Care
94 Main Street
Gorham, ME 04038
(207) 839-2655

Sources

American Dental Association (ADA) – Knocked-Out Tooth First Aid
American Dental Association (ADA) – Dental Emergencies: What to Do
Centers for Disease Control and Prevention (CDC) – Oral Health: Dental Injuries
National Institutes of Health (NIH) – Management of Traumatic Dental Injuries
Maine Board of Dental Practice – Standards for Emergency Dental Care

Conclusion

A knocked-out permanent tooth can be saved when first aid is performed correctly and a dentist is reached within 30 minutes. Pick up the tooth by the crown, rinse gently with milk or saline, replant it into the socket if possible, and store it in milk or saliva if replantation is not possible. Never store the tooth in water, never touch the root, and never attempt to replant a baby tooth.

Patients in Gorham, Westbrook, Portland, Windham, Standish, and surrounding communities can call Morgan Dental Care at (207) 839-2655 for same-day emergency appointments and after-hours on-call support. Located at 94 Main Street near the University of Southern Maine campus, the practice provides emergency examinations, replantation, splinting, and follow-up care for dental trauma.

Preventing knocked-out teeth starts with mouthguards during sports, helmets during cycling and skating, and regular dental checkups. When dental trauma does occur, acting quickly and calling a dentist who offers same-day care makes the difference between saving a tooth and losing it.

Last reviewed: September 2026

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Knocked-Out Tooth First Aid: How to Save a Tooth After Dental Trauma

Key Takeaways

Why Time Matters for a Knocked-Out Tooth