What can be associated with dental trauma?
- Enamel or crown fracture
- Root fracture
- Tooth displacement
- Knocked-out tooth
- Jaw or soft-tissue injury
Warning signs that need prompt assessment
Knocked-out permanent tooth
Uncontrolled bleeding
Jaw deformity or suspected fracture
Loss of consciousness, vomiting or neurologic symptoms
What an evaluation may include
- 1
Tooth position and mobility
- 2
Pulp and periodontal tests
- 3
Dental and facial imaging
- 4
Soft-tissue examination
What you can do now
- Seek emergency dental evaluation
- Handle a knocked-out permanent tooth by the crown, not root
- Keep the tooth moist and do not scrub the root
- Use emergency medical services for major head or facial injury
Full explanation
In depth
Dental trauma covers everything from a chipped edge to a tooth knocked completely out of its socket, and the first minutes matter more here than in almost any other dental situation. For a permanent tooth that has been avulsed, the chance of saving it declines rapidly with time out of the socket and with how the tooth is handled, which is why the immediate steps below are worth knowing before you need them. Trauma also frequently involves more than the obvious tooth: the socket, the supporting bone, the lip and the jaw joint can all be affected, and a tooth that looks intact can lose its nerve supply and darken months or years later. Any significant facial injury needs assessment for head injury and for jaw fracture before dental treatment is considered. A tooth that looks intact right after an injury can still lose its nerve supply and darken years later, which is why it is monitored over time instead of cleared after one check.
Also called: knocked-out tooth, avulsed tooth, broken tooth from injury, dental injury, tooth trauma.
Act immediately
A permanent tooth knocked out: what to do in the first minutes
- Find the tooth and pick it up by the crown, the chewing surface, never by the root
- Do not scrub it, do not use soap or disinfectant, and do not let it dry out
- If it is dirty, rinse briefly with milk or the person's own saliva; use water only if nothing else is available, and only for a few seconds
- If you can, reposition it into the socket straight away and have the person bite gently on a clean cloth to hold it
- If you cannot reimplant it, store it in milk, or in the person's own saliva held in the cheek if they are conscious and not at risk of swallowing it. Plain water is the worst option
- Get to a dentist or emergency department immediately; time out of the socket is the single biggest factor in the outcome
- Take the tooth with you even if it is broken
Do NOT attempt to reimplant a baby tooth. Doing so can damage the developing permanent tooth underneath. Take the child to be seen, but leave the tooth out.
First, rule out the serious
Injuries that need medical assessment before dental care
Loss of consciousness, confusion, repeated vomiting or memory loss after the injury
Suspected jaw fracture: a bite that suddenly does not meet, inability to open or close, or a step in the jawline
Heavy bleeding that does not stop with pressure
Deep facial lacerations, particularly through the lip border
Any injury where debris may be embedded in the lip or tongue
Injuries involving the eye or the base of the skull
Types of injury
What can happen to a tooth, and what each means
| Factor | Detail |
|---|---|
| Enamel chip or fracture | Often repairable with bonding. Keep the fragment if you have it, as it can sometimes be reattached. |
| Fracture involving dentine or the pulp | Needs prompt treatment. Exposed pulp is painful and requires urgent care to have the best chance of keeping the tooth vital. |
| Root fracture | May not be visible externally. Diagnosis needs radiographs, sometimes from more than one angle, and treatment depends on where along the root the fracture sits. |
| Luxation (tooth moved but still present) | The tooth may be loosened, pushed in, pushed out or displaced sideways. Usually needs repositioning and splinting. |
| Intrusion (driven into the bone) | Particularly significant in developing teeth, and managed differently depending on root development. |
| Avulsion (knocked completely out) | The time-critical injury. Outcome depends heavily on the first few minutes. |
| Alveolar fracture | The bone segment holding several teeth is fractured. Needs stabilization. |
Afterwards
Why follow-up matters even when the tooth looks fine
- A traumatised tooth can lose its nerve supply and die months or even years later, often painlessly
- Darkening of the tooth is a common late sign that the pulp has died
- Root resorption can begin after trauma and is detected only radiographically
- Splints need removing at the right time: too early or too late both cause problems
- Children's injuries need monitoring of the developing permanent tooth underneath
- Scheduled radiographic review over the following months and years is standard after significant trauma
Prevention
Reducing the risk of dental injury
- A custom-fitted mouthguard for contact and collision sports, which fits and stays in place far better than a boil-and-bite version
- Mouthguards for cycling, skateboarding and other activities where falls are common
- Addressing significantly protruding front teeth, which are at markedly higher risk of injury
- Not using teeth to open packaging or hold objects
- Home safety measures for young children learning to walk
Questions people ask
Common questions
01What should I do if a tooth gets knocked out?
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Handle it by the crown only, never the root. Do not scrub it or let it dry. If possible, put it straight back into the socket and bite gently on a cloth to hold it: that is the best outcome. If you cannot, store it in milk, or in the person's own saliva, and get to a dentist or emergency department immediately. Plain water is the worst storage medium because it damages the cells on the root surface. Time out of the socket is the biggest factor in whether the tooth survives.
02Can a knocked-out baby tooth be put back?
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No, and this is an important exception. Reimplanting an avulsed primary tooth risks damaging the developing permanent tooth sitting in the bone above it, so the standard advice is not to put it back. The child should still be seen promptly to check for other injuries, to assess the socket and surrounding bone, and to plan monitoring of the permanent tooth. Take the tooth with you so it can be confirmed the whole tooth is accounted for.
03My tooth was knocked but is still in place. Do I need to be seen?
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Yes. A tooth that has been displaced, loosened or pushed into the bone usually needs repositioning and splinting, and even a tooth that looks unmoved may have suffered damage to its nerve supply or root that only radiographs will show. There is also the socket and surrounding bone to assess. Prompt assessment improves outcomes, and it establishes the baseline against which later changes, darkening, resorption, are judged.
04Why did my tooth turn dark months after the injury?
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Darkening usually means the pulp has died, which is a well-recognized delayed consequence of trauma. The blood supply entering through the root tip can be disrupted at the time of injury even if the tooth stays in place, and the tissue dies quietly afterwards. It is often painless. Treatment is normally root canal treatment, and the discoloration can then be addressed with internal bleaching, a veneer or a crown. This is exactly why follow-up after trauma matters.
05How long do I have to save a knocked-out tooth?
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The prognosis declines steeply with time out of the socket, and with drying, so this is genuinely a matter of minutes instead of hours. Immediate reimplantation at the scene gives the best chance. If that is not possible, appropriate storage, milk or saliva, not water, buys some time by keeping the cells on the root surface viable. Treat it as an emergency and go straight to a dentist or emergency department.
06Will a mouthguard actually prevent dental injuries?
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Mouthguards substantially reduce the risk of dental injury in contact and collision sports, and a custom-fitted one made from an impression of your teeth fits better, stays in place and is more likely to be worn than a boil-and-bite version. They are worth considering for cycling, skateboarding and similar activities too, not only organized sport. If front teeth protrude significantly, the risk of injury is higher and orthodontic assessment is worth discussing separately.
07Should I keep a broken-off piece of tooth if I find it?
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Yes: a fragment from a chipped or fractured tooth can sometimes be reattached with bonding, particularly for a clean fracture found and brought in promptly, so keeping it (dry, in a clean container) and bringing it to the appointment keeps that option available. Even if reattachment turns out not to be possible, having the fragment can help the clinician understand exactly what happened to the tooth.
08How long does a splint stay on after a tooth is repositioned from trauma?
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The duration depends on the specific type of injury. A tooth that was simply loosened needs a shorter splinting period than one that was more significantly displaced or where the root itself may have been affected. The timing matters in both directions: removing a splint too early risks the tooth not stabilizing properly, while leaving it too long can itself cause problems, which is why the interval is specifically prescribed instead of left to guesswork.
09Can dental trauma affect a tooth that isn't even visibly damaged?
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Yes: the nerve supply entering through the root tip can be disrupted by the force of an impact even when the tooth itself shows no visible chip, crack or displacement, and the pulp can subsequently die without any external sign at the time. This is exactly why scheduled radiographic review over the following months and, in some cases, years is standard practice after significant trauma, instead of assuming an intact-looking tooth is unaffected.
10Is it safe to eat or drink normally after a tooth injury?
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Not immediately, and not on the injured side: practices typically advise a soft diet and avoiding chewing on an injured tooth for a period while healing gets underway, particularly where a tooth has been repositioned, splinted, or where a fracture has been treated. Specific guidance varies by injury type and should come from whoever assessed you, since the right restriction depends on exactly what was done.
11Can a tooth that was saved after trauma fail years later?
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Yes: root resorption and pulp death can both develop gradually after trauma and may not become apparent for months or even years, which is precisely why scheduled follow-up radiographs continue well beyond the initial treatment. A tooth that looked stable at the six-month check can still show a new problem at a later review, so ongoing monitoring genuinely matters, not being a formality once the initial healing period has passed.
12Is it worth keeping a tooth fragment in the freezer if I can't get to a dentist right away?
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No: a fragment or a whole avulsed tooth should never be frozen, since freezing damages the cells on the root surface just as badly as letting it dry out does. If you cannot reach a dentist immediately, the correct storage is milk or the person's own saliva at normal temperature, and getting to care as quickly as possible remains far more important than any storage method.
Related glossary terms
Sources
- Health InformationNational Institute of Dental and Craniofacial ResearchAccessed 2026-08-17
- Oral Health TopicsAmerican Dental AssociationAccessed 2026-08-17