What Happens When a Tooth Is Knocked Out
If you've had a tooth completely knocked out (avulsed), you probably felt panicked. This is one of the most serious dental emergencies because your tooth can actually be saved if you act quickly. About one in every 200-300 dental injuries involves a complete tooth avulsion. The good news is that with immediate action and proper emergency treatment, many avulsed teeth can be successfully restored to health and kept for years or even for life. Time is critical—the faster you get your tooth back in place, the better the outcome.
The Golden Hour: Time Matters Most
The most important factor in saving your tooth is how quickly you get it back into the socket. There's a concept called the "golden period"—if your tooth is reimplanted within about 15 minutes of being knocked out, it has the best chance of healing perfectly. Between 15 and 60 minutes, the tooth can still heal well if you store it correctly. After 60 minutes, the odds drop significantly because the special cells that hold your tooth in place (periodontal ligament cells) start dying from lack of oxygen and nutrients.
When your tooth is outside your mouth, these delicate cells need a specific environment to survive. Dry air, room-temperature storage, or inappropriate liquids can kill them quickly. The longer your tooth is stored improperly, the worse the outcome will be. But this doesn't mean you should give up if more than 60 minutes have passed—even with longer delays, saving your tooth is still possible, though complications become more likely.
What to Do Immediately
Here's what you should do if a tooth gets knocked out: First, find the tooth. Pick it up by the crown (the white part you see), never by the root. If it's dirty, rinse it gently with clean water or milk, but don't scrub it or scrape it. Keep it moist—don't let it dry out.
Ideally, put it in a special storage solution called Hanks Balanced Salt Solution if you have one available. If not, milk is your best option. Cold milk is better than room-temperature milk. In a pinch, you can put the tooth in your mouth (between your cheek and teeth), but not if there's a risk you'll swallow it.
Call your dentist or emergency dental clinic immediately and head there as fast as you can. Tell them you have an avulsed tooth—they'll understand the urgency. Don't waste time trying to disinfect the tooth extensively or worrying about how dirty it is.
Getting it back in place quickly is more important than perfect cleanliness. If you can't get to a dentist immediately and the tooth is very dirty, you can rinse it briefly with milk or saline solution, but minimize handling. For more on this topic, see our guide on Teeth Knocked Out Critical First Hour.
Reimplantation and Splinting
When you arrive at the dental office, your dentist will examine the tooth and socket to make sure there are no bone fractures or other problems. They'll clean the socket gently and then carefully guide your tooth back into place. This usually doesn't require anesthesia during the emergency visit because the tooth is being placed in your own socket. Your dentist will confirm correct position with an X-ray.
Once your tooth is back in place, it needs to be stabilized so you don't accidentally knock it loose again. Your dentist will use a flexible splint—a combination of wire and tooth-colored material bonded to adjacent teeth—to hold your tooth steady. This splint typically stays in place for one to two weeks. The splint is flexible rather than rigid because some tiny movement actually helps your tooth heal better. During this healing period, you'll need to be very gentle with your tooth—avoid chewing on that side, brush gently, and avoid physical activity that might cause impact to your mouth.
Root Canal Treatment
Because the blood vessel and nerve supply to your tooth are severed when it's knocked out, the nerve inside your tooth will die. This means you'll need root canal treatment. Your dentist might do this immediately or wait until after the splint is removed. If there was a long delay before reimplantation, an antibiotic paste might be placed inside the root canal first to reduce infection risk. After infection risk is controlled, your dentist will complete the root canal by filling it with an inert material.
Understanding Root Resorption
The biggest long-term complication following tooth avulsion is something called root resorption. This is where the body gradually dissolves the root of the tooth. It happens because the tooth is seen as foreign after the injury, and the body's inflammatory response tries to get rid of it.
The amount of resorption depends on how damaged the periodontal ligament was and how long the tooth was out of the socket. Teeth that were out for a long time have higher resorption rates than those reimplanted quickly. For more on this topic, see our guide on Sudden Tooth Pain - Diagnosis and Emergency Relief.
Unfortunately, there's no way to completely stop root resorption once it starts, but certain treatments using antibiotic pastes or special medications inside the tooth can slow it down. Your dentist will monitor your tooth with regular X-rays to watch for resorption and can plan for prosthetic replacement if the tooth eventually needs to be extracted.
Long-Term Outlook
Many reimplanted teeth do very well long-term, especially if they were only out of the socket briefly and were stored properly. Studies show that with proper emergency management and ongoing care, a significant percentage of reimplanted teeth remain functional for 10 years or longer. Your tooth will feel different than before—it won't have quite the same sensation because the nerves were damaged—but it will function normally for chewing and look completely natural.
You'll need to take extra care of this tooth long-term. Avoid hard or sticky foods on that side of your mouth. Brush and floss very gently around it. Come in for regular checkups so your dentist can monitor for any problems. Even with perfect care, some reimplanted teeth are eventually lost due to progressive resorption, but many others last for decades or even a lifetime.
Every patient's situation is unique. Talk to your dentist about the best approach for your specific needs.ression, poorly controlled diabetes, or other conditions impairing wound healing may necessitate more aggressive antimicrobial protocols and modified endodontic timing. Pediatric patients presenting with avulsion of developing permanent teeth represent a particularly challenging scenario, requiring preservation of tooth vitality when feasible to permit continued root development and apical closure. In these cases, pulpotomy procedures preserving coronal pulpal vitality while removing infected apical tissue may be considered as an alternative to complete root canal treatment.
Conclusion
: Emergency Management and Long-Term Success
Successful management of avulsed permanent teeth requires rapid intervention during the critical golden period, appropriate storage in HBSS or milk when immediate reimplantation is not feasible, and meticulous surgical technique minimizing additional trauma. Flexible splinting for 7-14 days permits early mobilization and functional healing while maintaining adequate stabilization. Timely endodontic treatment controls infection and may slow subsequent resorptive complications. Despite optimal management, teeth experiencing avulsion carry inherently worse prognosis than non-traumatized teeth, with progressive external resorption limiting long-term retention in many cases. Educational initiatives emphasizing rapid retrieval and appropriate storage of avulsed teeth, delivered to athletic trainers, coaches, school personnel, and the general public, represent important mechanisms for improving population-level treatment outcomes.
> Key Takeaway: If a permanent tooth gets completely knocked out, time is critical—get it back in your mouth within 15 minutes if possible, store it in milk or a special solution to keep it moist, and go directly to emergency dental care. Your dentist will reimplant it, stabilize it with a splint, and perform root canal treatment to save your tooth. With proper emergency management, many reimplanted teeth remain functional long-term.