Tooth Sensitivity

What is tooth sensitivity?

Tooth sensitivity, also known as dentine hypersensitivity, is a common condition that causes short, sharp pain or discomfort when teeth are exposed to certain stimuli. These triggers often include cold air, hot or cold foods and drinks, sweet or acidic substances, and even brushing. The pain is usually sudden and temporary, but it can be intense and disruptive to daily life.

Sensitivity occurs when the protective outer layer of enamel is worn away or when gums recede and expose the root surface of the tooth. Beneath the enamel lies dentine, a porous layer containing thousands of microscopic channels called tubules. These tubules connect directly to the nerve inside the tooth. When exposed dentine comes into contact with temperature changes or chemical stimuli, fluid movement within these tubules stimulates the nerve and causes pain.

While tooth sensitivity is common, it should not be ignored. In some cases, it signals underlying dental problems such as erosion, gum disease or cracked teeth. Proper assessment helps identify the cause and ensures appropriate treatment.

Why tooth sensitivity matters

Persistent sensitivity can significantly affect quality of life. Many people avoid cold drinks, hot foods or brushing certain areas of the mouth due to discomfort. This avoidance can lead to poor oral hygiene in sensitive areas, increasing the risk of decay and gum disease.

Sensitivity may also indicate enamel loss or gum recession, both of which weaken the tooth’s natural protection. Over time, untreated sensitivity can progress into more serious problems, including structural damage and increased vulnerability to decay.

Addressing sensitivity early helps protect tooth structure, improve comfort and prevent long-term complications.

Causes and risk factors

Enamel wear and erosion

Frequent exposure to acidic foods and drinks can soften and dissolve enamel, leaving dentine exposed. Tooth erosion from fizzy drinks, fruit juices, sports drinks and acid reflux is a major contributor to sensitivity.

Gum recession

When gums recede, the root surface of the tooth becomes exposed. Unlike enamel, root surfaces are covered by a thin layer called cementum, which wears away easily. Once dentine is exposed, sensitivity often develops.

Aggressive brushing habits

Brushing too hard or using stiff toothbrushes can gradually wear away enamel and gum tissue. Incorrect brushing technique, particularly scrubbing horizontally along the gum line, increases the risk of sensitivity.

Tooth grinding and clenching

Grinding places excessive force on teeth and can wear down enamel over time. It may also cause micro-fractures that expose sensitive inner layers of the tooth.

Dental procedures

Temporary sensitivity is common after certain treatments such as fillings, crowns, whitening or deep cleaning. This usually resolves as the tooth settles and tissues heal.

Cracked or damaged teeth

Cracks allow stimuli to reach the inner tooth layers more easily. Pain may occur when biting or when exposed to temperature changes.

Tooth decay

Early decay can expose dentine and cause sensitivity. As decay progresses, sensitivity may develop into more persistent pain.

Symptoms

Tooth sensitivity may present in several ways, including:

• Sharp pain when consuming cold or hot foods
• Discomfort when breathing in cold air
• Sensitivity to sweet or acidic foods
• Pain during brushing or flossing
• Sudden twinges that resolve quickly
• Sensitivity localised to one tooth or affecting multiple teeth
• Increased discomfort after whitening treatments
• Sensation of exposed or tender tooth surfaces

The severity and frequency of symptoms vary depending on the underlying cause.

How tooth sensitivity affects oral health

Sensitivity often leads people to avoid brushing certain areas of the mouth thoroughly. This increases plaque build-up and raises the risk of decay and gum disease in already vulnerable areas. Over time, this creates a cycle where sensitivity contributes to further oral health problems.

Exposed dentine is also more prone to wear and decay. Without intervention, the protective structure of the tooth continues to weaken, increasing the likelihood of fractures and long-term damage.

Managing sensitivity helps maintain effective oral hygiene and protects tooth integrity.

Diagnosis

Diagnosis focuses on identifying exposed dentine and underlying contributing factors.

• Clinical examination – checking for enamel wear, gum recession and exposed root surfaces.
• Sensitivity testing – applying gentle stimuli to identify affected teeth.
• X-rays – ruling out decay or deeper structural issues.
• Bite assessment – identifying grinding or excessive force patterns.
• Review of oral hygiene habits – evaluating brushing technique and products used.
• Medical history review – identifying reflux or other contributing conditions.

Accurate diagnosis ensures treatment targets the correct cause.

Treatment and management

Desensitising toothpaste and topical treatments

Specialist toothpaste designed for sensitive teeth works by blocking the dentinal tubules or calming nerve response. Regular use over several weeks is often required to achieve noticeable improvement. Professional desensitising agents may also be applied in the dental clinic for faster relief.

Fluoride treatments

Fluoride strengthens enamel and helps protect exposed dentine. High-fluoride toothpaste and professional fluoride applications support remineralisation and reduce sensitivity over time.

Improving brushing technique

Switching to a soft-bristled toothbrush and using gentle circular motions reduces mechanical wear on enamel and gums. Patients are advised to avoid excessive pressure and abrasive toothpaste.

Managing gum recession

When gum recession is the primary cause, treatment focuses on stabilising gum health. This may include improved plaque control, professional cleaning and, in some cases, gum grafting procedures to restore coverage over exposed roots.

Treating enamel erosion

Reducing acid exposure and improving dietary habits help prevent further enamel loss. Protective coatings and remineralising products may be recommended to strengthen remaining enamel.

Restorative treatment

If sensitivity is caused by structural damage such as cracks or worn areas, restorative treatment may be necessary. Composite bonding, crowns or protective sealants can cover exposed dentine and restore tooth integrity.

Managing grinding habits

Night guards help protect enamel from excessive wear caused by grinding and clenching. Addressing these habits reduces ongoing damage and sensitivity progression.

Prevention and self-care

• Using desensitising toothpaste regularly – reduces nerve stimulation and discomfort.
• Brushing gently with soft bristles – protects enamel and gum tissue.
• Limiting acidic foods and drinks – reduces enamel erosion risk.
• Waiting before brushing after acid exposure – allows enamel to reharden.
• Maintaining regular dental check-ups – early detection prevents progression.
• Managing grinding habits – reduces enamel wear.
• Staying hydrated – supports saliva production and enamel protection.

When to seek urgent dental care

Seek professional assessment if you experience:

• Sensitivity that worsens suddenly
• Persistent pain rather than short twinges
• Sensitivity accompanied by swelling or bleeding
• Pain when biting
• Signs of cracked or fractured teeth
• Sensitivity combined with visible holes or decay
• Symptoms that interfere with eating or sleeping

These may indicate underlying problems requiring prompt treatment.

FAQs and common questions

Is tooth sensitivity permanent?

Sensitivity can often be reduced or eliminated with proper treatment. However, if enamel loss or gum recession is severe, ongoing management may be required to control symptoms.

How long does desensitising toothpaste take to work?

Most people notice improvement within two to four weeks of consistent use. Continued use helps maintain results.

Can whitening treatments cause sensitivity?

Yes. Whitening temporarily increases enamel permeability, which can lead to sensitivity. This usually settles within a few days, but assessment is recommended before whitening if you already have sensitive teeth.

Should I stop brushing sensitive teeth?

No. Avoiding brushing allows plaque to build up and worsens oral health. Using gentle technique and appropriate products is essential.

Why does sensitivity affect some teeth more than others?

Differences in enamel thickness, gum recession and bite pressure mean some teeth are more vulnerable to exposure and wear.

Can sensitivity be a sign of decay?

Yes. Early decay may cause sensitivity. Dental examination and X-rays help determine whether decay is present.

Does stress make sensitivity worse?

Stress can increase grinding and clenching, which accelerates enamel wear and contributes to sensitivity.

Are electric toothbrushes suitable for sensitive teeth?

Yes, when used with soft brush heads and gentle pressure. Many models include pressure sensors that help prevent excessive force.

Can children experience tooth sensitivity?

Yes. Enamel defects, erosion and early decay can cause sensitivity in children. Early assessment is important.

Will a filling stop sensitivity?

If sensitivity is caused by exposed dentine or structural damage, a filling or bonding may provide relief by sealing the area.

Does mouthwash help sensitive teeth?

Some fluoride mouthwashes help strengthen enamel, but they should be used alongside proper brushing and interdental cleaning.

Can sensitivity return after treatment?

Yes, particularly if underlying causes such as erosion or grinding are not addressed. Ongoing prevention is important.

Call to action

If tooth sensitivity is affecting your comfort or daily routine, professional assessment can identify the cause and provide targeted treatment. Our team can help restore comfort, protect your teeth and prevent further damage. Contact us to arrange an appointment and receive expert care for sensitive teeth.