If your child knocks out a tooth, the most important steps are to find the tooth, hold it by the chewing surface only, keep it moist in cold milk, and get to a pediatric dentist within 30 minutes. A knocked-out permanent tooth is a true dental emergency, and the speed of your response can determine whether the tooth is saved. Below, we cover what to do for both baby teeth and permanent teeth, how dentists treat knocked-out teeth, and how to prevent this common childhood injury.
How Often Do Children Knock Out Teeth?
Knocked-out teeth are more common in childhood than many parents expect. The American Association of Endodontists reports that more than five million teeth are knocked out every year in the United States (American Association of Endodontists). The medical term for a completely knocked-out tooth is “avulsion,” and it accounts for up to 16% of all traumatic dental injuries in the permanent teeth of children, according to the International Association of Dental Traumatology (IADT).
A global epidemiological study found that the worldwide prevalence of traumatic dental injuries in primary teeth is approximately 22.7% (International Journal of Paediatric Dentistry). Falls are the most common cause of dental trauma in young children, while sports injuries become the leading cause for school-age kids. The AAPD reports that 10 to 39% of all childhood dental injuries are sports-related (AAPD).
Boys are about twice as likely as girls to experience dental trauma, according to a meta-analysis in BMC Oral Health (BMC Oral Health). The peak ages for knocked-out baby teeth are 2 to 4 years, and the peak ages for knocked-out permanent teeth are 7 to 12, based on data reviewed in StatPearls (StatPearls/NIH). The upper front teeth are involved in the vast majority of cases.
For active children in Yorktown Heights, Cortlandt Manor, and Mahopac, knowing how to respond to this emergency is essential preparation.
Knocked-Out Baby Tooth vs. Permanent Tooth
The response to a knocked-out tooth depends entirely on whether it is a baby tooth or a permanent tooth. These two situations require very different actions.
A knocked-out baby tooth should not be placed back into the socket. Reimplanting a baby tooth can damage the developing permanent tooth underneath, according to the IADT and the AAPD. For a baby tooth, rinse your child’s mouth gently with warm water, apply gauze to control any bleeding, and call your pediatric dentist to schedule an evaluation.
A knocked-out permanent tooth is a dental emergency. The tooth should be reimplanted as quickly as possible. Research published in the journal Dental Traumatology found that teeth reimplanted within 15 to 30 minutes have the highest survival rates (Dental Traumatology). A classic study by Andreasen estimated that up to 90% of avulsed teeth could be successfully retained if reimplanted within 30 minutes (Andreasen, 1966).
If you are not sure whether the lost tooth is a baby tooth or a permanent tooth, a pediatric dentist has the specialized training to evaluate the situation and determine the right course of action.
Step-by-Step Emergency Response for a Knocked-Out Permanent Tooth
Every second counts when a permanent tooth is knocked out. Follow these steps in order.
First, stay calm and comfort your child. A calm parent helps a scared child feel safe, which makes the next steps easier.
Find the tooth as quickly as possible. Pick it up by the crown (the white, visible part used for chewing). Never touch the root. The root contains delicate periodontal ligament cells that are critical for reattachment, and handling it can destroy those cells.
If the tooth is dirty, rinse it briefly under cold running water for no more than 10 seconds. Do not scrub, soap, or wrap it in tissue. Do not let it dry out.
If your child is old enough and calm enough, try gently placing the tooth back into the socket. Have them bite down on a clean piece of gauze or a damp cloth to hold it in place. This is the single best thing you can do to save the tooth.
If you cannot reimplant it, place the tooth in a small container of cold milk. Milk preserves the root cells significantly better than water. A study published in the Journal of Endodontics found that storing an avulsed tooth in milk reduced the failure rate of reimplanted teeth by 56.4% compared to keeping it dry (Journal of Endodontics). Do not store the tooth in tap water.
Then get to your pediatric dentist or the nearest emergency room immediately. Call ahead so they can prepare.
Our team at Cohen Family Smiles provides emergency dental care for families in Yorktown Heights and the surrounding Northern Westchester and Putnam County communities. Call us at 914-245-2965.
What Happens at the Dentist After a Knocked-Out Tooth
When you arrive at the dental office, the dentist will evaluate the tooth, the socket, and the surrounding area. Digital X-rays will be taken to check for bone fractures, root damage, and injuries to neighboring teeth.
At our Yorktown Heights office, we use advanced digital X-ray technology that captures detailed images quickly with significantly less radiation than traditional film.
For a knocked-out permanent tooth, the dentist will reimplant it into the socket (if you were unable to do so) and then splint it to the neighboring teeth using a thin, flexible wire or composite material. This splint holds the tooth stable for one to two weeks while the periodontal ligament reattaches. A study in Scientific Reports found an overall survival rate of 65.3% for properly reimplanted avulsed teeth over an average observation period of 3.5 years (Scientific Reports).
Root canal therapy is often needed within one to two weeks after reimplantation, depending on the stage of root development. If the root was fully developed at the time of the injury, the nerve inside the tooth typically does not survive and must be treated to prevent infection.
For a knocked-out baby tooth, the dentist will take X-rays to confirm that no fragment remains in the socket and to check the health of the permanent tooth developing below. If the baby tooth was lost early, a space maintainer may be recommended to prevent surrounding teeth from shifting into the gap.
Factors That Affect Whether a Knocked-Out Tooth Can Be Saved
| Factor | Better Outcome | Worse Outcome |
| Time outside the mouth | Reimplanted within 15 to 30 minutes | More than 60 minutes outside the socket |
| Storage medium | Milk, saliva, or saline solution | Dry storage, tap water, or tissue |
| Root handling | Held by the crown only | Root was scrubbed, dried, or touched |
| Root development stage | Open apex (still developing) | Closed apex (fully developed root) |
| Patient age | Older children (closer to age 16) | Younger children with immature roots |
| Splinting and follow-up | Proper splint placed within hours | Delayed or no dental follow-up |
Sources: International Association of Dental Traumatology (IADT), Journal of Endodontics, Scientific Reports
What NOT to Do When a Tooth Is Knocked Out
Certain mistakes can permanently reduce the chances of saving the tooth. Avoid these common errors.
Do not pick the tooth up by the root. The root surface contains living cells that the body needs to reattach the tooth to the jawbone. Touching, scrubbing, or drying the root destroys those cells.
Do not store the tooth in tap water. Water damages root surface cells through osmotic pressure. Milk, saline, or saliva are all better options.
Do not wrap the tooth in a dry tissue or paper towel. This causes the root to dry out rapidly.
Do not attempt to reimplant a baby tooth. Forcing a baby tooth back into the socket can injure the permanent tooth developing underneath. Pediatric dentists do not reimplant primary teeth, according to the IADT and AAPD guidelines (IADT).
Do not wait until the next day to seek care. With every passing minute, the chance of successful reattachment decreases. Families in Peekskill, Shrub Oak, and Jefferson Valley should call a pediatric dentist immediately or head to the nearest emergency room if it happens after hours.
We provide same-day emergency dental appointments at our Yorktown Heights office for knocked-out teeth and other urgent injuries.
How to Prevent Knocked-Out Teeth in Children
Prevention is the best strategy. While no parent can eliminate every risk, a few practical steps make a big difference.
Custom-fitted mouthguards are the most effective form of protection during sports. The ADA estimates that athletes who do not wear mouthguards are 60 times more likely to suffer a dental injury (ADA). The ADA also reports that mouthguards prevent more than 200,000 oral injuries in the United States every year (ADA).
Children with increased overjet (upper front teeth that protrude) face a significantly higher risk. A study in Community Dentistry and Oral Epidemiology found that children with overjet greater than 3 mm were 3.8 times more likely to experience severe dental trauma (Community Dentistry and Oral Epidemiology). Early orthodontic evaluation can identify this risk factor and correct it before an injury happens.
For toddlers, childproofing the home with stair gates, corner guards, and non-slip surfaces helps reduce falls that commonly lead to dental injuries. The AAPD notes that oral injuries account for 18% of all physical injuries in children under age 6 (AAPD).
Routine dental visits also play a role in preparedness. Your pediatric dentist can assess your child’s risk factors, recommend a mouthguard, and help you plan for emergencies before they happen.
Families in Somers, Mohegan Lake, and Putnam Valley can schedule a first visit at our Yorktown Heights office to discuss prevention and emergency planning.
Frequently Asked Questions
What happens if a child knocks a tooth out completely?
What happens if a child knocks a tooth out completely depends on whether it is a baby tooth or a permanent tooth. A permanent tooth should be reimplanted as quickly as possible, ideally within 30 minutes. A baby tooth should not be reimplanted because doing so could damage the permanent tooth forming underneath. In both cases, see a pediatric dentist right away for X-rays and a full evaluation.
How long can a knocked-out tooth survive outside the mouth?
A knocked-out tooth can survive outside the mouth for up to 60 minutes if stored properly in milk, saline, or saliva. The best outcomes occur when the tooth is reimplanted within the first 15 to 30 minutes. After 60 minutes in dry conditions, the periodontal ligament cells on the root surface begin to die, and the chances of successful reattachment drop significantly.
Will a baby tooth grow back if it gets knocked out?
A baby tooth will not grow back if it gets knocked out, but the permanent tooth underneath will eventually come in on its own. This usually happens on the natural eruption schedule, starting around age 6 for front teeth. If the baby tooth was lost early, a space maintainer may be needed to hold the gap open and prevent neighboring teeth from shifting. Families in Yorktown Heights can visit our office to discuss whether a space maintainer is right for their child.
What is the 3-3-3 rule for toothache?
The 3-3-3 rule for toothache is a short-term pain management approach that involves taking three 200 mg ibuprofen tablets (600 mg total), three times a day, for up to three days. It helps control inflammation and pain while you wait for a dental appointment. This rule is not a substitute for professional treatment, and children should only take ibuprofen in doses recommended by their pediatrician.
Should you go to the ER for a knocked-out tooth?
You should go to the ER for a knocked-out tooth if your pediatric dentist is unavailable, if there are signs of a head injury, or if the bleeding will not stop. Emergency rooms can stabilize pain and bleeding, but they typically cannot reimplant a tooth. A pediatric dentist is the best provider for reimplantation and follow-up care. Families in Northern Westchester and Putnam County can call our Yorktown Heights office at 914-245-2965 for same-day emergency scheduling.
Can a dentist fix a knocked-out permanent tooth?
A dentist can fix a knocked-out permanent tooth by reimplanting it into the socket and splinting it to neighboring teeth for stability. The tooth is held in place for one to two weeks while the bone and ligaments heal. Root canal treatment is often required after reimplantation. Success rates are highest when the tooth is stored in milk and reimplanted within 30 minutes of the injury.
Where to Go From Here
A knocked-out tooth is one of the most time-sensitive dental emergencies a family can face. The steps are straightforward: find the tooth, hold it by the crown, keep it moist in milk, and get to a dentist fast.
If your child wears braces or clear aligners, let the dental team know right away so they can evaluate any damage to the orthodontic appliance alongside the tooth injury.
We also recommend talking to your child’s dentist about a protective dental crown if any teeth were weakened by the trauma, and about custom mouthguards before your child’s next sports season.
At Cohen Family Smiles in Yorktown Heights, we handle knocked-out teeth, dental trauma, and all types of pediatric emergencies with gentle, expert care. We serve families across Croton-On-Hudson, Katonah, Bedford Hills, Mt. Kisco, Millwood, and the greater Hudson Valley. Call us at 914-245-2965 or contact our office to schedule an appointment.
