Broken Tooth With the Nerve Exposed? Emergency Bonding and Treatment Options
Most broken teeth can wait a few days. This one cannot.
When a fracture reaches the pulp — the living tissue at the centre of the tooth — the situation changes. The pain is usually severe and constant rather than fleeting. Cold air alone can be unbearable. And there is a window, measured in hours rather than weeks, in which the nerve can sometimes be preserved rather than removed.
Recognising it is therefore worth knowing about, because the difference between attending today and attending next week can be the difference between a small restoration and root canal treatment.
What Happens When a Broken Tooth Exposes the Nerve?
What is going on inside the tooth?
The pulp is living tissue containing nerves, blood vessels and immune cells, enclosed in a rigid chamber. When a fracture breaks through into it, that tissue is directly exposed to the mouth — to bacteria, temperature changes, air, food and pressure. Bacterial contamination begins immediately, and the pulp becomes inflamed. Because the chamber is rigid and cannot expand, the pressure of that inflammation compresses the nerve fibres, which is why the pain is so intense. Left untreated, the pulp usually becomes irreversibly inflamed and then necrotic, and infection spreads towards the root tip.
Enamel
The hardest tissue in the body, forming the outer shell. It contains no nerves, which is why an enamel-only chip usually causes no discomfort.
Dentine
Softer, and penetrated by many thousands of microscopic tubules per square millimetre, each running from the outer surface towards the pulp and containing fluid and fine processes from pulp cells. Movement of fluid within these tubules is what produces sensitivity to cold, air and sweetness. Dentine is therefore not a passive barrier — it is a route.
The pulp
Living connective tissue with a nerve supply, blood supply and immune function. It forms dentine during development and continues to lay down reparative dentine in response to slow irritation. Its critical limitation is that it sits in a rigid, enclosed space with a very restricted blood supply entering through a small opening at the root tip. That means it copes poorly with significant inflammation: pressure rises, blood flow is compromised, and the tissue can die.
Common Causes
Traumatic injury. A fall, a sporting impact, a collision or an accident, most often affecting the upper front teeth.
Biting hard objects. Ice, boiled sweets, olive stones, nut shells, popcorn kernels, or using teeth to open packaging.
Progressive decay. Where tooth decay has advanced through enamel and dentine, the remaining structure over the pulp can collapse. This route is often less dramatic but no less serious.
Large or failing restorations. A tooth with a very large filling has thin, unsupported walls. When a cusp shears off, the fracture can run directly into the pulp chamber. Grinding makes this considerably more likely.
Recognising the Signs
Intense, sharp pain that is spontaneous and persistent rather than momentary, often throbbing, and frequently worse when lying down.
Extreme temperature sensitivity, particularly to cold, with the pain lingering long after the stimulus has gone. Lingering pain is a significant clinical sign — brief sensitivity that stops immediately is far less concerning.
A visible pink or red spot within the fractured surface. This is the pulp itself and is the clearest indicator.
Bleeding from the tooth, as distinct from bleeding from the gum or a cut lip.
Swelling of the gum, face or jaw, which suggests infection has already progressed and makes the situation more urgent still.
It is worth noting the opposite pattern too. A tooth that was extremely painful and then goes quiet has not necessarily improved — the pulp may have died. Infection can then continue silently towards the root tip, as covered in our article on signs of infection spreading to the jawbone.
What to Do Before You Are Seen
• Contact a dentist immediately. This is a same-day problem
• Keep any fragments in milk, saliva or contact lens solution — not water
• Rinse gently with warm salt water
• Avoid very hot, very cold and sweet food and drink
• Do not chew on that side
• Cover the area with dental wax if there is a sharp edge, but do not press it into the exposed area
• Take over-the-counter pain relief if suitable for you, following the packet instructions
• Never place aspirin against the gum or the tooth
• Sleep with your head slightly elevated, which can reduce throbbing
• Do not attempt to seal the tooth with household glue or any DIY material
Our article on temporary relief before an appointment covers symptom management in more detail, though it is not a substitute for being seen here.
Emergency Bonding — What It Involves and Why
Emergency treatment for an exposed pulp aims to do several things quickly: control pain, seal the tooth against further bacterial contamination, protect the exposed tissue, and restore enough contour that the tooth is not being traumatised further.
Typically this means local anaesthetic, careful cleaning of the fractured area, placement of a protective material over or near the exposed pulp, and a bonded composite restoration sealing the tooth.
The important point is what this achieves. In selected cases — a small, recent exposure in a young, otherwise healthy tooth — prompt sealing can allow the pulp to remain vital, sometimes with a partial pulpotomy in which only the most superficial inflamed tissue is removed. Outcomes depend heavily on how large the exposure is, how long it has been contaminated, and the state of the pulp on examination, so no particular result can be assumed.
Where the pulp is already irreversibly inflamed or has died, emergency treatment instead relieves pain and stabilises the tooth ahead of definitive root canal treatment.
Emergency bonding is usually an interim measure. A definitive restoration follows, which may be a larger composite restoration, a dental crown or, where too little tooth remains, extraction with replacement by a dental implant or bridge.
When Professional Dental Assessment May Be Needed
Seek same-day care from an emergency dentist if you have:
• A visible pink or red spot in a fracture
• Bleeding from the tooth itself
• Severe or throbbing toothache
• Pain that lingers well after hot or cold contact
• Pain when biting after an injury
• A loose adult tooth or one that has been displaced
Seek immediate emergency care if you have:
• A dental abscess with discharge or a bad taste
• Fever or feeling generally unwell
• Difficulty swallowing, breathing or opening your mouth
That last group requires urgent attention without delay.
Reducing the Risk
• Wear a custom mouthguard for contact sport
• Wear a night guard if you grind
• Do not bite ice, boiled sweets, nut shells or packaging
• Do not use teeth as tools
• Treat decay early — attend routine check-ups with radiographs at the recommended interval
• Attend hygiene appointments
• Have very large old restorations reviewed, since cusps can often be protected before they fracture
• Report a cracked tooth or unexplained sensitivity promptly
Key Points to Remember
• A fracture reaching the pulp is a same-day problem
• A pink or red spot in the fracture, or bleeding from the tooth, indicates exposure
• Pain that lingers after cold is clinically significant
• The pulp sits in a rigid chamber, so inflammation raises pressure and compromises blood supply
• Prompt sealing can sometimes allow the pulp to be preserved, but outcomes vary
• A tooth that stops hurting has not necessarily recovered
• Never attempt to seal a tooth with household adhesive
The NHS page on broken teeth covers first aid and when to seek help.
Frequently Asked Questions
1. How do I know the nerve is exposed?
The most reliable signs are a visible pink or red spot within the fractured surface and bleeding from the tooth itself. Severe spontaneous pain and pain that lingers well after cold contact also point towards pulp involvement. Confirmation requires examination and usually radiographs, so if you suspect it, seek same-day care rather than trying to judge it yourself.
2. Will I definitely need root canal treatment?
Not necessarily. Where the exposure is small, recent and in an otherwise healthy tooth, prompt sealing and sometimes a partial pulpotomy can allow the pulp to remain vital. Where the pulp is already irreversibly inflamed or has died, root canal treatment is generally required. Your dentist will assess and explain which situation applies.
3. How quickly do I need to be seen?
The same day. Bacterial contamination of exposed pulp begins immediately, and the likelihood of preserving the nerve reduces with time. If there is also swelling, fever or difficulty swallowing, treat it as an immediate emergency rather than waiting for a routine appointment.
4. Why does it hurt so much?
The pulp is enclosed in a rigid chamber that cannot expand. When it becomes inflamed, pressure rises and compresses the nerve fibres directly, while blood flow through the small opening at the root tip is compromised. The combination produces pain that is severe, often throbbing, and characteristically worse when lying down.
5. My tooth stopped hurting — does that mean it healed?
Not necessarily. Pain ceasing can mean inflammation has settled, but it can equally mean the pulp has died and the nerve fibres are no longer signalling. Infection can then progress quietly towards the root tip and into the surrounding bone. A tooth that has had severe pain and then gone quiet should still be assessed.
6. Can I seal the tooth myself until my appointment?
No. Household adhesives are unsafe in the mouth, and pressing any material onto exposed pulp tissue causes further damage and contamination. Cover a sharp edge with dental wax if it is cutting your tongue, keep the area clean with warm salt water, take suitable pain relief and get seen the same day.
Conclusion
Of all the ways a tooth can break, this is the one where timing genuinely changes the outcome.
If you can see pink in the fracture, if the tooth is bleeding, or if cold produces pain that goes on and on after the cold has gone, do not wait to see how it settles overnight.
For urgent dental care, 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 Yasha Y Shirazi · reviewed by Dr Yasha Y Shirazi, GDC 195843
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.
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