A sudden sharp twinge when sipping a hot drink or biting into something cold can be deeply unsettling. If you have ever wondered whether that fleeting discomfort could mean you have a cracked tooth and sensitivity, you are certainly not alone. Thousands of adults across London search for answers to this exact concern every month.
A cracked tooth is one of the more common dental issues that brings patients to seek urgent advice. The difficulty is that cracks are not always visible to the naked eye, and the sensitivity they produce can range from mild and intermittent to sharp and persistent. Understanding the possible causes, recognising the signs, and knowing when to seek a professional dental assessment can make a significant difference to the outcome.
What Is a Cracked Tooth and Why Does It Cause Sensitivity?
Quick answer: A cracked tooth occurs when a fracture develops in the tooth structure, which may extend through the enamel and into deeper layers. This crack can expose the sensitive dentine or pulp tissue beneath, allowing temperature changes, pressure, and certain foods to trigger sharp or lingering sensitivity. The severity of symptoms typically depends on the location, depth, and extent of the crack, and a clinical examination is needed to determine the most appropriate course of action.
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Common Causes of a Cracked Tooth
Biting on hard objects such as ice, boiled sweets, olive stones, or unpopped popcorn kernels is one of the most frequent causes.
Bruxism (teeth grinding), particularly during sleep, places sustained pressure on the teeth that can weaken enamel and create hairline cracks over time.
Large existing fillings may compromise the structural integrity of a tooth, making the remaining walls more vulnerable to fracturing.
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Age-related wear is another contributing factor — cracks become more common in adults over 40.
Trauma or injury, whether from a sports impact, a fall, or an accident, can also cause immediate cracks. For accident-related fractures, our guide on broken tooth after an accident provides specific guidance.
Recognising the Signs and Symptoms
- Sharp pain when biting or chewing, often occurring when you release the bite rather than when you first clamp down
- Sensitivity to hot, cold, or sweet foods and drinks
- Intermittent discomfort that comes and goes
- Swelling of the gum around the affected tooth may develop if bacteria have reached the pulp
- Difficulty pinpointing the exact tooth is also common
If you are experiencing any combination of these symptoms, it may be helpful to arrange a dental assessment to understand what might be happening. Understanding the differences between a cracked and chipped tooth can also help you identify your symptoms.
Understanding the Dental Science
Each tooth is made up of several layers. The outermost layer is enamel, the hardest substance in the human body. Beneath the enamel lies dentine, a yellowish layer that contains millions of microscopic tubules leading towards the centre of the tooth. The pulp contains blood vessels, nerves, and connective tissue.
When a crack penetrates through the enamel and reaches the dentine, external stimuli can travel through those microscopic tubules and stimulate the nerve endings within the pulp. This is what produces that characteristic sharp, sudden sensitivity.
If the crack extends further into the pulp itself, bacteria from the mouth may enter, potentially causing inflammation or infection. This is why early assessment can be valuable. For more on fracture classifications, see our complete guide to types of tooth fractures.
Fast Fixes: Temporary Measures for Managing Discomfort at Home
- Desensitising toothpaste containing potassium nitrate or stannous fluoride may help reduce sensitivity over several days of regular use.
- Avoiding temperature extremes — try drinking beverages at a lukewarm temperature.
- Chewing on the opposite side of your mouth reduces pressure on the affected tooth.
- Over-the-counter pain relief such as paracetamol or ibuprofen may help manage discomfort.
- Maintaining gentle oral hygiene around the area is important.
- Avoiding hard, crunchy, or sticky foods can help prevent further damage.
These measures are intended as short-term comfort strategies. For more comprehensive advice, see our guide on emergency dental repair options.
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Treatment Approaches Your Dentist May Consider
Dental bonding may be suitable for minor cracks that are limited to the enamel.
A dental crown is often considered when a more significant portion of the tooth structure is compromised. A crown fits over the entire visible portion of the tooth. You can learn more about how same-day dental crowns may help protect damaged teeth.
Root canal treatment may be appropriate if the crack has extended into the pulp and caused inflammation or infection.
In some cases, extraction may be necessary if the crack extends below the gum line or splits the tooth vertically.
When Professional Dental Assessment May Be Needed
- Persistent or worsening sensitivity that does not settle with home measures over a few days
- Pain that occurs spontaneously, without an obvious trigger
- Swelling, tenderness, or a raised area on the gum
- Difficulty eating or drinking due to discomfort
- A visible crack, chip, or rough edge on a tooth
- Sensitivity following a dental injury or trauma
If you are experiencing symptoms that concern you, emergency dental appointments in London are available when you need prompt care.
Prevention and Oral Health Advice
- Wear a custom mouthguard if you grind your teeth.
- Use a mouthguard during contact sports.
- Avoid using your teeth as tools.
- Be cautious with hard foods.
- Attend regular dental check-ups.
- Maintain good daily oral hygiene.
Frequently Asked Questions
Can a cracked tooth heal on its own?
Unlike bone, tooth enamel and dentine do not have the ability to regenerate or repair themselves once damaged. A cracked tooth will not heal on its own. While minor enamel craze lines may not require treatment, any crack that is producing sensitivity or discomfort should be assessed by a dentist. Our article on whether a tooth can regrow after a break explains the science behind this.
Is a cracked tooth considered a dental emergency?
Whether a cracked tooth requires emergency attention depends on the severity of the symptoms. A small crack with occasional mild sensitivity may be manageable until a routine appointment. However, if you are experiencing severe pain, significant swelling, or signs of infection, it is advisable to seek prompt dental care.
Can a cracked tooth lead to infection?
If a crack extends deep enough to expose the pulp tissue, bacteria from the mouth may enter and cause inflammation or infection over time. Our guide on whether a broken tooth can cause infection covers this topic comprehensively.
What should I avoid eating if I suspect a cracked tooth?
Avoid very hard foods such as nuts, hard sweets, ice, and crusty bread, as well as very sticky foods like toffee or caramel. Extremely hot or cold foods and drinks may also trigger sensitivity. Chewing on the opposite side and opting for softer foods at moderate temperatures can help reduce discomfort.
Dental symptoms and treatment options should always be assessed individually during a clinical examination.
Disclaimer: This article is for general informational purposes only and does not constitute personalised dental or medical advice. Every patient's situation is different. Always seek a professional dental assessment for diagnosis and treatment. If you are concerned about any symptoms described in this article, contact a dentist or call NHS 111 for guidance.
Article reviewed: March 2026 · Next review due: March 2027
This article was written by the Emergency Dentist London editorial team and medically reviewed by a GDC-registered dental professional. It is intended for general informational purposes and should not replace individual advice from your dentist or GP. Emergency Dentist London is a CQC-registered dental practice.
Sources: NHS — Chipped, Broken or Cracked Tooth · NHS — Toothache · General Dental Council · British Dental Association