Knocked-Out Tooth: The First 60 Minutes Can Make a Difference

A knocked-out tooth is one of the most time-sensitive dental emergencies a person can experience. Whether it happens during sport, a fall or an accident, the moments immediately after the injury can have a significant bearing on whether the tooth can be assessed for reinsertion. Knowing what to do — and what not to do — before reaching a dentist may reduce further damage and give a qualified dental professional the best possible information to work with.

If an adult permanent tooth is knocked out, handle it carefully by the crown (the visible white part), not the root. Keep it moist — ideally in milk or between your cheek and gum — and contact an emergency dentist immediately. Time is critical. Do not attempt to reinsert a baby (milk) tooth. If there is heavy, uncontrolled bleeding or signs of significant head trauma, call 999 or attend A&E.

Is a Knocked-Out Tooth a Dental Emergency?

Yes — a knocked-out adult tooth is always a dental emergency. The periodontal ligament fibres that attach the tooth to the jawbone begin to deteriorate rapidly once the tooth leaves the socket. Research published in dental literature suggests that teeth reinserted within 30 minutes have a meaningfully better long-term prognosis than those left out for longer periods. Beyond an hour out of the mouth, the chances of successful reimplantation diminish considerably, though a dental assessment remains important regardless.

This does not mean that a tooth reimplanted after 60 minutes cannot be assessed — it simply means that acting promptly gives a qualified dental professional more to work with. Every situation is different, and only a dentist can evaluate what is clinically appropriate following an examination.

For guidance on what to expect when you contact a provider, Emergency Dentist London's guidance on treating a knocked-out or broken tooth explains how urgent dental injuries are typically approached.

Adult Teeth vs Baby Teeth: An Important Distinction

Before taking any action, it is essential to know whether the tooth that has come out is a permanent (adult) tooth or a baby (primary/milk) tooth.

• Adult permanent tooth: Follow the first-aid steps below and seek immediate dental assessment. Reimplantation may be considered.
• Baby tooth: Do not attempt to reinsert it. Forcing a milk tooth back into the socket risks damaging the developing adult tooth underneath. Contact a dentist for advice, but this is generally less time-critical than an adult tooth avulsion.

If you are unsure which type of tooth has been lost — particularly in children aged five to eight, where both types may be present — a dentist can confirm this during assessment.

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

The following steps are based on current NHS dental guidance for managing an avulsed (knocked-out) tooth. These are general measures only and cannot replace professional clinical assessment.

1. Find the tooth and pick it up carefully

Handle the tooth by its crown — the smooth white part that is normally visible in the mouth. Avoid touching the root. The root surface contains delicate periodontal ligament cells that are important for the healing process.

2. Assess the tooth

If the tooth is dirty, rinse it briefly (no longer than ten seconds) under cold running water or milk. Do not scrub it, use soap, wrap it in tissue or let it dry out.

3. Keep it moist

Storing the tooth correctly while you travel to a dentist is one of the most important steps. Options in order of preference:

• Reinsert it into the socket (adults only, if the person is conscious, calm and not at risk of swallowing it). Hold it gently in place by biting softly on a clean cloth.
• Store it in milk — full-fat or semi-skimmed are both suitable.
• Place it in the cheek (between the inner cheek and the gum), keeping it moist with saliva.
• Use a tooth preservation kit if one is available (some sports facilities and pharmacies carry these).

Do not store the tooth in tap water for extended periods, as this can damage the root cells.

4. Control the bleeding

Bite gently on a clean, damp piece of gauze or a folded clean cloth to manage bleeding from the socket. Do not pack the socket with cotton wool.

5. Contact an emergency dentist immediately

Phone ahead so the dental team can prepare. Describe what has happened, how long ago it occurred and how the tooth has been stored.

What Might an Emergency Dentist Do?

Dental management of a knocked-out tooth depends entirely on the clinical findings. A dentist will typically:

• Take a detailed history of the injury, including the time elapsed since the tooth was displaced
• Examine the tooth, the socket and surrounding structures
• Take dental X-rays to assess the root, socket and any potential bone involvement
• Discuss whether reimplantation is clinically appropriate in the specific circumstances
• Explain the relevant treatment options, associated risks and likely follow-up requirements
• Obtain informed consent before any procedure

It is important to understand that not every knocked-out tooth is suitable for reimplantation. Factors such as the patient's age, the condition of the tooth and socket, any underlying health conditions and the time elapsed since the injury will all influence the clinical decision. A dentist will explain what they have found and the options available.

Treatment at the initial appointment may include reimplantation and splinting of the tooth to adjacent teeth for a period of stabilisation. Follow-up appointments are typically required, and root canal treatment may be needed at a later stage. The dental team will explain what to expect in your individual situation.

You can find further information about what a private emergency dental appointment typically involves by visiting Emergency Dentist London.

What to Avoid After a Tooth Has Been Knocked Out

Certain actions can reduce the chances of a successful clinical outcome:

• Do not scrub or disinfect the tooth root — even a gentle scrub can remove the ligament cells needed for healing
• Do not wrap the tooth in tissue or cotton wool — these materials dry the tooth out rapidly
• Do not store the tooth in tap water for a prolonged period — it is less suitable than milk for preserving root cells
• Do not take painkillers that contain aspirin if aspirin is not already prescribed for you, and never place aspirin directly against the gum or socket
• Do not delay contacting a dentist in the hope that the situation will resolve on its own — it will not
• Do not attempt to reinsert a baby tooth

Managing Discomfort While You Travel to a Dentist

Pain following dental trauma can range from mild to significant. While you arrange to be seen:

• Apply a cold compress or ice pack wrapped in a cloth to the outside of the cheek to help reduce swelling — do not place ice directly on the skin
• A pharmacist may be able to advise on appropriate over-the-counter pain relief; note that suitability varies depending on age, pregnancy, known allergies, medical conditions and any other medicines you are taking
• Avoid hot drinks, alcohol and anything that might disturb the socket
• If you cannot reach your usual dentist, same-day walk-in emergency dental care in London may be an option worth considering

Important: Temporary measures may ease discomfort, but they cannot diagnose or treat the underlying dental injury. A dental examination is required.

When to Call 999 or Go to A&E

A knocked-out tooth alone does not require a 999 call, but certain accompanying signs do. Seek immediate emergency medical help — call 999 or go to your nearest A&E — if there is:

• Difficulty breathing or swallowing
• Rapidly increasing or severe swelling of the face, neck or throat
• Heavy bleeding that cannot be controlled
• Loss of consciousness or confusion
• Significant head or facial trauma — particularly if a head injury is suspected
• Signs of a serious spreading infection

These are potentially life-threatening situations that require emergency medical assessment, not a dental appointment.

Frequently Asked Questions

Can a tooth really be saved if it has been out for more than an hour?

The chances of successful reimplantation reduce as time passes, and dental literature generally suggests that outcomes are more favourable when the tooth is reimplanted or kept moist and assessed within 30 to 60 minutes. However, a dentist should still assess the tooth and the injury regardless of how much time has passed — they are best placed to advise on what is clinically appropriate in your specific situation.

Should I try to push the tooth back in myself?

For an adult tooth, gently repositioning it into the socket can help preserve the root surface cells — but only if the person is calm, conscious and not at risk of swallowing it. Do not force it. If there is any uncertainty, store it in milk and go straight to a dentist. Never attempt to reinsert a baby tooth.

What storage option is best if I cannot reimplant the tooth?

Milk is the most widely recommended and readily available option, as it has an osmolality and pH that helps preserve root surface cells better than tap water. Cold is preferable to warm. Specialist tooth preservation products are available in some pharmacies and sports settings, but milk is a practical and evidence-supported alternative.

Is this type of dental injury covered by the NHS?

NHS emergency dental treatment is available in the UK, though access and waiting times vary. If you cannot access NHS care promptly, a private emergency dental provider may be able to see you sooner. Fees vary depending on the treatment required, and any provider should explain costs before proceeding. Confirm current availability and charges directly with the dental provider.

What happens after the tooth has been reimplanted?

A splint is often applied to stabilise the tooth against adjacent teeth for a period of weeks. Follow-up appointments are needed to monitor healing. Root canal treatment may be required, as the nerve and blood supply to a reimplanted tooth are frequently affected. Your dentist will outline the likely treatment pathway based on your clinical findings.

My child knocked out a tooth — what should I do?

First, identify whether it is a baby tooth or an adult tooth. If it is a baby tooth, do not reinsert it; contact a dentist for advice. If it is an adult tooth in an older child or teenager, follow the same first-aid principles as for an adult — handle the crown only, keep it moist, and seek emergency dental assessment as quickly as possible.

Finding Emergency Dental Care in London

If a tooth has been knocked out, time is a significant factor and it is important to contact a dental provider without delay. Emergency Dentist London's out-of-hours emergency dentist service provides information about urgent dental services in London and can be a useful starting point for identifying appropriate care.

For those unable to access a dentist directly, NHS 111 (call 111 or visit 111.nhs.uk) can provide guidance on accessing urgent dental care in your area. You can also ask your regular dental practice whether they have an emergency or out-of-hours contact number.

Medical and Dental Disclaimer

This article provides general information and does not constitute individual medical or dental advice, diagnosis or treatment. Dental symptoms can have several possible causes and may require examination by a qualified dental professional. Seek urgent advice if symptoms worsen. Call 999 or attend A&E if you have difficulty breathing or swallowing, rapidly increasing facial or neck swelling, severe facial trauma, loss of consciousness or heavy uncontrolled bleeding.