Broken Crown Emergency? Practical Steps for Repair and Immediate Care
There is a particular moment of alarm when something hard turns up in your mouth mid-meal and you realise it is not part of the food.
Sometimes the crown comes away whole and the tooth beneath feels odd but comfortable. Sometimes the crown fractures, leaving a jagged edge and a stump that objects loudly to cold air. These two situations feel similar but are not equally urgent.
Knowing which you are dealing with, and what to do in the first hour, makes a genuine difference to how straightforward the repair turns out to be.
What Should You Do in a Broken Crown Emergency?
What are the immediate priorities?
Retrieve the crown or fragments and keep them safe — do not throw them away, since an intact crown can often be recemented. Rinse your mouth with warm salt water. Check the exposed tooth for sharp edges and cover them with dental wax or sugar-free gum if they are cutting your tongue or cheek. Avoid chewing on that side and avoid very hot, cold or sweet food. Take over-the-counter pain relief if you need it and it is suitable for you. Then contact your dental practice the same day — the exposed tooth structure beneath a crown is vulnerable and should not be left indefinitely.
Wear and ageing
Cements degrade over years, and the seal at the margin can gradually fail. Ceramic can develop micro-cracks from thousands of thermal and mechanical cycles. Most crowns that come off have been in service a long time.
Biting forces and habits
Biting ice, boiled sweets, nut shells, olive stones or popcorn kernels concentrates enormous force on a small area. Using teeth to open packaging does the same. Teeth grinding applies sustained, off-axis load that ceramic tolerates poorly — it is one of the leading causes of crown fracture and a strong argument for a night guard.
Underlying tooth problems
This is the important one. A crown very often comes off not because the crown failed but because the tooth beneath it did. Decay at the margin undermines the preparation, so the crown loses its foundation. A root-treated tooth can fracture beneath the crown. In these cases recementing is not appropriate — the underlying problem needs addressing first.
Trauma
A fall, a sporting knock or a blow to the face.
What Actually Happens When a Crown Comes Off
A crowned tooth has been prepared — reduced in size to make room for the crown. What remains is a shaped stump, and its outer surface is often dentine rather than enamel.
Dentine contains microscopic tubules running to the pulp, which is why the exposed stump can be acutely sensitive to cold air, cold water and sweet things. It is also softer than enamel and decays more readily, so it does not tolerate being left uncovered.
Two further things happen if the tooth is left exposed for weeks. Neighbouring and opposing teeth begin to drift into the space, which can mean the original crown no longer fits when you eventually attend. And the gum can grow over the margin. Both make the eventual repair more complicated.
Where a crown has fractured but part remains cemented, the sharp remnant can lacerate the tongue or cheek. Where a post-retained crown comes out with the post attached, there is a possibility the root has fractured, which changes the outlook considerably.
Immediate Steps at Home
If the crown has come off intact:
• Rinse it gently under cold water and store it somewhere safe — a small container, not wrapped in tissue where it can be thrown away
• Rinse your mouth with warm salt water
• Clean the exposed tooth gently with a soft brush
• Do not attempt to glue it back with household adhesive. Superglue is not safe in the mouth, sets in the wrong position and contaminates the surfaces so that proper recementing becomes difficult
• Temporary dental cement from a pharmacy is acceptable as a short-term measure if you are confident the crown seats correctly, but it is not a substitute for an appointment
If the crown has fractured:
• Keep any pieces you can find
• Cover sharp edges with dental wax or a small piece of sugar-free chewing gum
• Rinse with warm salt water after eating
• Avoid the area when chewing
Managing sensitivity: avoid very hot and very cold food and drink, avoid sweet things, and use a desensitising toothpaste dabbed onto the exposed area with a fingertip. Our article on temporary toothache relief before an appointment covers this in more detail.
Pain relief: over-the-counter analgesia following the packet instructions, if suitable for you. Never place aspirin directly against the gum — it causes a chemical burn.
When Professional Dental Assessment May Be Needed
Contact the practice the same day if:
• A crown has come off or fractured
• You have significant toothache or throbbing pain
• The tooth is sharply sensitive to temperature
• There is a sharp edge cutting your tongue or cheek
• You have pain when biting
Seek urgent care through an emergency dentist if you have:
• A dental abscess, discharge or a bad taste
• Fever or feeling generally unwell
• Bleeding that does not settle
• Difficulty swallowing or opening your mouth — this needs immediate attention
If you swallowed the crown, it usually passes without incident, but tell your dentist. If you think you may have inhaled it, or you have coughing or breathing difficulty, seek urgent medical attention.
Repair and Replacement Options
Recementing the existing crown. The most straightforward outcome. It requires the crown to be intact, the underlying tooth to be sound with no decay, and enough tooth structure remaining to retain it. Your dentist will clean both surfaces, check the fit and cement it.
Repair. Limited options exist. A small chip in a porcelain-fused-to-metal crown can sometimes be repaired with composite, though the bond to ceramic is less durable than the original material and it is generally an interim measure.
A new crown. Needed where the crown is fractured, no longer fits, or the tooth has been restored differently. Our dental crowns page explains the process, and our article on E-Max crowns compared with older designs covers material choices.
Core build-up first. Where decay has undermined the preparation, the tooth is rebuilt before a new crown is made.
Root canal treatment. If the pulp has become infected or irreversibly inflamed.
Extraction and replacement. Where the tooth has fractured below the gum or the root is split, it may not be restorable. Options then include a dental implant or a bridge. Our article on what determines implant suitability covers the assessment involved.
Reducing the Risk
• Wear a night guard if you grind
• Do not bite ice, boiled sweets, nut shells or packaging
• Clean thoroughly around crown margins — decay there is the most common reason crowns fail
• Attend routine check-ups and hygiene appointments so margins are monitored
• Report any looseness, clicking or altered bite early
• Wear a mouthguard for contact sport
Key Points to Remember
• Keep the crown or fragments — an intact crown can often be recemented
• Do not use household glue; it makes proper repair harder
• Exposed dentine is sensitive and decays readily, so do not delay treatment
• Neighbouring teeth drift within weeks, which can stop the original crown fitting
• A crown coming off often signals a problem with the tooth beneath, not the crown
• Swelling, fever or difficulty swallowing needs urgent care
• Grinding is a leading cause of crown fracture
The NHS page on crowns explains what crowns are and how they are fitted.
Frequently Asked Questions
1. Can my old crown be put back on?
Often, provided it is intact, the underlying tooth is sound with no decay, and sufficient tooth structure remains to retain it. Your dentist will assess all three before recementing. Where decay has undermined the preparation or the tooth has fractured, a new crown or other treatment is needed first.
2. Can I glue the crown back myself?
Not with household adhesive. Superglue is not safe in the mouth, sets rapidly in whatever position it lands, and contaminates the fitting surfaces so a proper recement may become impossible. Temporary dental cement from a pharmacy is acceptable as a short-term measure if the crown seats easily and correctly, but see your dentist promptly.
3. How long can I leave a tooth without its crown?
Not long. Exposed dentine is sensitive and vulnerable to decay, and adjacent and opposing teeth begin to drift within a few weeks — sometimes enough that the original crown no longer fits. Aim to be seen within days rather than weeks, and sooner if there is pain, sharpness or swelling.
4. Why did my crown come off if the crown itself is fine?
Usually because something changed beneath it: decay at the margin undermining the preparation, cement failure over time, or fracture of the underlying tooth. This is why your dentist examines the stump carefully rather than simply cementing the crown straight back. Identifying the cause is what prevents a repeat.
5. Is a broken crown a dental emergency?
It depends. Pain, swelling, bleeding, a sharp edge lacerating soft tissue, fever or difficulty swallowing make it urgent, and difficulty swallowing or breathing requires immediate attention. A crown that has come away cleanly with no pain is less urgent but should still be dealt with within days to protect the tooth.
6. Will I need a root canal?
Not necessarily. It depends on whether the pulp has been affected — by decay, by fracture, or by prolonged exposure. Your dentist will assess symptoms and take a radiograph. Many crowns are simply recemented or remade without any root treatment being needed.
Conclusion
The first hour matters more than people expect. Keep the crown, keep the tooth covered, and ring the practice.
The other thing worth knowing is that a crown coming off is often a message about the tooth underneath rather than the crown itself. That is why the examination is not just a formality before it goes back on.
To be seen about a broken or lost crown, book an appointment at 22 Wimpole St, London W1G 8GQ, or call 020 7183 0692.
Dental symptoms and treatment options should always be assessed individually during a clinical examination.
Dental Disclaimer
This article is for general educational information only and is not professional dental advice, diagnosis, or a treatment recommendation. Information here is general and cannot replace an in-person assessment by a qualified, GDC-registered dental professional. Symptoms, suitability, fees, timelines, and outcomes vary according to individual clinical circumstances. If you have pain, swelling, or other concerning symptoms, seek prompt professional dental care. Always request a written treatment plan and cost estimate before proceeding with treatment.
Written Date: 27 August 2026 Next Review Date: 27 August 2027
Written by Dr Narges Ameri · reviewed by Dr Narges Ameri, GDC 325081
This article is general information, not personal clinical advice. For a diagnosis and a plan tailored to you, book a consultation with a GDC-registered dentist.
