Knocked Out Tooth

Overview

A knocked-out tooth (sometimes called an avulsed tooth) is when a tooth is pushed completely out of its socket in the jaw. This is a dental emergency. The tooth and the gum around it can often be saved, but what you do in the first few minutes matters a lot. A permanent (adult) tooth has the best chance if it is put back in place quickly — ideally within 30 minutes, and often still possible within an hour or two. A baby (first) tooth should never be put back in, because it can damage the adult tooth growing underneath.

Dental injuries like this are quite common, especially in children and young adults. They happen most often during sport, play, falls, and accidents.

Anyone can knock out a tooth, but it is most common in children around 7 to 10 years old (when adult front teeth are coming through), teenagers playing contact sports, and adults who have falls, bike or car accidents, or facial injuries.

Symptoms

Common symptoms

• A tooth is completely out of the gum, and you may be holding it or find it nearby
• Bleeding from the empty tooth socket
• Pain and tenderness in the gum and jaw
• Swelling of the lip, gum, or face
• A gap where the tooth used to be, which can feel strange or upsetting
• The tooth may look whole, cracked, or chipped

Symptoms in children

• Crying, distress, or being unable to explain what happened
• Refusing to eat or drink because of pain
• Bleeding that looks heavy to a worried parent, even when it is small
• Other injuries such as a cut lip, bumped head, or sore jaw after a fall

Symptoms in older adults

• Teeth may come out more easily if the gums have receded or bone has been lost over time
• Other teeth nearby may feel loose
• Falls are a common cause, so check for other injuries too
• If you take blood-thinning medicine, bleeding may last longer — tell the dentist or doctor

Causes

Main causes

• Sport injuries, especially in sports without a mouthguard
• Falls, including falls from bikes, scooters, or playground equipment
• Car, motorbike, or cycling accidents
• Being hit in the face during play, fighting, or an accident
• Biting down hard on something solid, or a blow during a seizure
• Tripping or bumping into furniture, doors, or hard surfaces

Risk factors

• Playing contact sports such as rugby, boxing, hockey, or basketball without a mouthguard
• Not wearing a seatbelt or helmet
• Teeth that stick out forward (an overjet), which are easier to hit
• Having had a dental injury before
• Being a young child learning to walk and climb, or a teenager in active sport
• Dry mouth, loose teeth, or gum disease, which can make teeth less stable
• Conditions that affect balance or cause falls
• Alcohol use, which raises the risk of falls and accidents

When to see a doctor

See a doctor urgently if:

• A permanent tooth has come out — get dental help straight away, even if it is late at night or a weekend
• You are not sure whether the tooth was a baby or adult tooth
• A tooth is loose, pushed in, or moved sideways
• There is a deep cut to the lip, gum, or face, or bleeding that will not stop
• The jaw is sore, swollen, or does not close properly
• Your child has had a bang to the head, even if they seem fine at first

Book a routine appointment if:

• A tooth looks darker or changes colour weeks or months after an injury
• A tooth feels tender when biting, or feels different from the others
• You had a dental injury in the past and want the tooth checked
• You want advice about a mouthguard for sport

Diagnosis

A dentist will examine your mouth, the empty socket, and the tooth itself. They will check nearby teeth for looseness, cracks, or breaks, and feel your jaw for signs of fracture. They will also ask how and when the injury happened, whether the tooth was handled or cleaned, and how it was stored. This helps them decide whether the tooth can be put back and what follow-up you need.

Tests that may be done

• A dental exam of the tooth, socket, gums, and nearby teeth
• Dental X-rays to look at the root, the bone, and other teeth
• X-rays or scans of the jaw if a break is suspected
• Checking the tooth's nerve response where possible
• In some cases, a referral to a specialist or hospital dental team for complex injuries

What to expect at your appointment

The exam is usually quick and gentle, and the dentist will explain each step. If the tooth can be put back, this is often done at the first visit. You may be given advice about soft foods, gentle cleaning, and follow-up appointments. Expect to come back for checks over the next weeks and months, because problems with a knocked-out tooth can show up later even when everything seems fine at first.

Treatment

Treatment depends on whether the tooth was a baby or adult tooth, how long it was out, how it was stored, and whether other injuries happened. For an adult tooth, the aim is to put it back in place as soon as possible and help it settle. For a baby tooth, the aim is to keep the area clean and protect the adult tooth growing underneath. If a tooth cannot be saved, your dentist will talk with you about ways to replace it.

Self-care at home

• Permanent tooth: pick it up by the crown (the white part), not the root
• If it is dirty, rinse it briefly with milk or salt water — do not scrub or use soap
• If you can, gently push it back into the socket and bite on a clean cloth or gauze to hold it
• If you cannot put it back, keep it in milk or salt water, or inside your cheek if you are an adult and there is no risk of swallowing it
• Do not let the tooth dry out, and do not wrap it in tissue or paper
• Baby tooth: do not put it back — instead, apply gentle pressure with clean gauze to stop bleeding and see a dentist
• For pain and swelling, hold a cold pack wrapped in a cloth against your face for short periods
• Eat soft foods and avoid very hot drinks until you have been seen
• Do not smoke or use alcohol-based mouthwash while the gum is healing

Medical treatments

Your dentist may clean the socket gently and place the tooth back, then hold it steady with a flexible splint — a small wire or soft material fixed to the teeth next to it — for a period of days to weeks. You may be offered pain relief suitable for you, and in some cases antibiotics if there is a risk of infection; your dentist or doctor will decide this. For adult teeth whose root has finished forming, a root canal treatment is often needed later to protect the tooth from the inside. Follow-up visits are important to check the tooth is settling and to catch problems early. For a baby tooth that cannot stay, the dentist may simply leave the gap and monitor the adult tooth, sometimes with an X-ray.

When is surgery considered?

Surgery is not usually needed for a simple knocked-out tooth. It may be considered if a tooth is deeply pushed into the gum or bone, if the jaw is broken, if a tooth cannot be saved and needs to be removed, or later on if a tooth is lost and you choose a dental implant or other replacement. Your dentist will explain the options, benefits, and risks, and can refer you to a specialist if needed.

Living with this condition

In the first days and weeks, your mouth may feel sore and strange. Eat softer foods, brush gently around the injured area with a soft brush, and avoid biting on the treated tooth. Keep your follow-up appointments, even if everything feels fine — this is how early problems are spotted. If you play sport, ask your dentist when it is safe to return and get a well-fitting mouthguard before you do.

Lifestyle tips

• Wear a mouthguard for contact sports and activities where falls are possible
• Wear a helmet for cycling, skating, and motorbike riding, and always use a seatbelt
• Avoid using your teeth to open packets, bottles, or crack nuts
• Keep up regular dental check-ups so small problems are found early
• If you grind your teeth at night, ask your dentist about protection
• Cut down on smoking, which slows healing in the gums

Diet and exercise

Choose soft, cool foods while your mouth heals — yoghurt, soup, mashed vegetables, pasta, and smoothies are good choices. Avoid very hot, crunchy, sticky, or spicy foods for a while, and avoid biting into hard foods with the front teeth. Drink plenty of water. Gentle exercise is fine, but avoid contact sport and swimming pools for the first couple of weeks unless your dentist says otherwise, and always protect your mouth when you return to sport.

Mental health and emotional wellbeing

It is normal to feel shaken, worried, or upset after a dental injury, especially if it involved pain, blood, or an accident. Children may be clingy or anxious for a while, and teenagers may feel self-conscious about how their smile looks. These feelings usually settle, but if worry, low mood, or trouble sleeping lasts more than a few weeks, talk to your doctor or dentist. Help is available, and asking for it is a sign of strength.

Prevention

Many knocked-out teeth can be prevented. A well-fitting mouthguard is one of the simplest and most effective protections for sport, and helmets and seatbelts protect the face in crashes. If your teeth stick out forward, orthodontic treatment can reduce the risk of injury. Teaching children safe play and keeping trip hazards out of the home also helps.

Vaccines

There is no vaccine for dental injuries. Keeping up with general health checks and dental visits is still important for your overall health.

Screening programmes

Regular dental check-ups let your dentist spot loose teeth, worn teeth, or bite problems that could raise your injury risk. Ask about a custom mouthguard if you or your child play sport.

Complications

If left untreated

• The tooth cannot be saved and the gap remains
• The tooth root or surrounding bone is damaged, making the tooth loose over time
• The tooth changes colour or the nerve inside dies
• Infection in the gum or bone, which can cause pain and swelling
• Other teeth shift out of line, which can affect your bite
• Speech or eating changes, especially with front teeth
• In children, damage to the adult tooth still growing under the gum

Long-term outlook

The outlook is often good, especially when a permanent tooth is put back quickly and kept moist. Many people keep their tooth for years, sometimes for life, with regular check-ups. Some teeth do need extra treatment later, such as a root canal or a replacement if the tooth is lost. Whatever happens, your dental team has safe, well-tested ways to restore your smile and your comfort, and they will support you at every step.

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