Broken or Knocked-Out Tooth: What to Do in the First Minutes

If a tooth is knocked out entirely the first minute decides its fate: hold it by the crown not the root, rinse it gently without scrubbing, and put it straight back in its socket or store it in milk and reach a dentist within thirty minutes. A partial fracture is different, keep the broken piece and book an urgent rather than immediate appointment.

A completely knocked-out tooth

This is the most time-critical of all dental situations, and the chance of saving the tooth falls with every passing minute outside the mouth.

The steps in order

1. Hold the tooth by the crown, the white visible part, and never touch the root
2. Do not scrub the root or clean it with a brush, it carries living cells that allow the tooth to reattach
3. Rinse it gently in water or milk for a few seconds only if it is dirty
4. Put it back in place with gentle pressure and bite on a tissue to hold it, which is by far the best option
5. If that is not possible place it in a cup of milk, or in the injured person saliva inside their mouth between cheek and gum if they are conscious
6. Reach a dentist within thirty minutes

Why milk?

The ligament cells on the root surface are what allow the tooth to reattach, and they are highly sensitive to drying and to plain water.

Plain water kills them within minutes because its salt concentration differs from that of the cells, whereas milk has a composition close to body fluids and keeps them alive for hours.

Storing a tooth in water is therefore worse than leaving it dry in some studies, and saliva is better than water though less good than milk.

Time

Time out of the mouth	Chance of success
Under 5 minutes	Excellent
5-30 minutes in a suitable medium	Good
30-60 minutes	Moderate
Over an hour dry	Poor

An important exception

Never replant a child baby tooth, because doing so can damage the developing permanent tooth bud beneath it. Go straight to a dentist without attempting replacement.

Partial fractures

Type of fracture	Sign	Treatment	Urgency
Crack in enamel	A fine line, no pain	Monitoring or polishing	Routine appointment
Chip in enamel	Rough edge, no sensitivity	Cosmetic repair
Fracture into dentine	Sensitivity to cold and air	Composite filling	Within days
Fracture exposing the pulp	A red point, bleeding, severe pain	Pulp or root canal treatment	Immediate
Root fracture	Mobility and pain on biting	Splinting or extraction	Immediate

Keep the broken piece in milk or saline, since it can sometimes be bonded back and gives a better cosmetic result than any restoration.

What to do until you reach the clinic

• Rinse your mouth gently with lukewarm water
• A cold compress on the cheek from outside
• Bite on clean gauze if the gum is bleeding
• An ordinary painkiller at your usual dose
• Cover a sharp edge with orthodontic wax or sugar-free gum to protect the tongue
• Avoid chewing on the injured side

What not to do

• Do not scrub the root of a knocked-out tooth or disinfect it with anything
• Do not store it in plain water for long
• Do not wrap it in a dry tissue
• Do not replant a baby tooth
• Do not place aspirin on the gum
• Do not delay because there is no pain, since a fracture reaching the pulp may be painless if the nerve has died

When to go to general emergency rather than a dentist

• Loss of consciousness even briefly after the injury
• Bleeding that will not stop with pressure
• Suspected jaw fracture or teeth not meeting properly
• A deep lip or tongue wound needing stitches
• Vomiting, dizziness or confusion after a blow to the head

Dental injuries frequently accompany head injuries, and assessing the overall condition comes before assessing the tooth.

Follow-up after an injury

Treating the tooth on the day of the accident is not the end of the matter, since some complications appear months later and cannot be predicted on day one.

Timing	What is checked
After a week	Tooth stability and gum condition
After a month	Pulp vitality testing and radiographs
After 3 months	Colour change and root resorption
After 6 months	Radiographs of bone around the root
After a year	Final assessment

A tooth that has taken a heavy blow may keep its vitality for months and then lose it, and the signs are colour change or inflammation appearing on radiographs, so follow-up is not optional even when everything looks normal.

At Zed Dental Center

We give dental injuries immediate priority in the schedule and begin by assessing tooth vitality through examination and imaging, because a tooth that appears sound after a blow may lose vitality weeks later and needs monitoring.

Frequently asked questions

Can a tooth knocked out hours ago be replanted?

The chances fall sharply, but go to a dentist regardless since some cases succeed partially and the tooth serves for a period.

My tooth broke and does not hurt, should I wait?

No, the absence of pain does not mean the pulp is safe, and the nerve may have been damaged with inflammation appearing weeks later.

Does a tooth change colour after a blow?

Yes, it may turn greyish after weeks or months, indicating pulp death and needing root canal treatment.

How do I protect my teeth during sport?

With a custom-made mouthguard, far better than a stock one in both protection and comfort.

Does a replanted tooth last a lifetime?

It depends on how quickly it was replanted and the state of the root, and many cases last many years with regular follow-up.

What if a crown or veneer comes off?

Keep the piece and do not glue it with any household adhesive, and contact your dentist since it may be recemented as it is.

An emergency?

With dental injuries, minutes matter.

Reviewed by the medical team at Zed Dental Center.