What Causes Tooth Sensitivity and How to Fix It

Tooth sensitivity is a common concern that affects many people at some point in their lives. It can make enjoying hot drinks, cold foods, or even sweet treats uncomfortable. At Envisage Dentistry Possilpark, we aim to help patients understand why sensitivity occurs and how it can be managed effectively. 

Tooth sensitivity occurs when the protective layer of enamel wears down or when gums recede, exposing the dentine beneath. This exposes microscopic tubules leading to the nerve inside the tooth, causing pain when triggered by temperature, pressure, or certain foods. 

Understanding the causes and treatments of tooth sensitivity is key to maintaining comfort and protecting your long-term oral health. 

Tooth sensitivity occurs when the underlying layer of your teeth, called dentine, becomes exposed. Dentine contains tiny tubules that connect to the nerve inside the tooth. When exposed, these tubules allow stimuli such as temperature changes or acidic foods to reach the nerve, causing discomfort or sharp pain. 

Common signs include: 

• Short, sharp pain when consuming hot or cold drinks 

• Discomfort with sweet or acidic foods 

• Temporary sensitivity when brushing or flossing 

While occasional mild sensitivity is normal, persistent or severe pain should be checked by a dentist to rule out underlying problems. 

Worn Enamel 

Enamel protects the teeth, but over time it can wear down due to brushing too hard, using abrasive toothpaste, or consuming acidic foods and drinks. Thinner enamel exposes the dentine, increasing sensitivity. 

Gum Recession 

Gums naturally recede with age or due to gum disease. When the roots of teeth are exposed, the dentine is no longer protected, often leading to sensitivity. 

Tooth Decay or Damage 

Cavities, cracks, or worn fillings can expose the inner layers of teeth, triggering sensitivity. Even small areas of decay can create noticeable discomfort. 

Recent Dental Treatments 

Procedures such as fillings, professional cleaning, or whitening can temporarily increase sensitivity. This is usually short-term and resolves as teeth adjust. 
 

For mild sensitivity, simple at-home strategies can help alleviate discomfort: 

• Use a medium-bristled toothbrush and brush gently to avoid further enamel wear or gum recession. 

• Switch to a desensitising toothpaste, which contains compounds that block pain signals from reaching the tooth nerve. Results can appear after several weeks of consistent use. 

• Avoid acidic foods and drinks or rinse your mouth with water after consumption to neutralise acids. 

• Limit teeth grinding, using a mouthguard at night if necessary. 

Maintaining excellent oral hygiene with brushing twice daily, flossing, and regular rinsing helps protect teeth from decay and gum problems that can worsen sensitivity. 

If sensitivity persists despite good home care, your dentist can provide targeted treatments. These may include: 

• Fluoride treatments applied in practice to strengthen enamel and reduce sensitivity. 

• Dental bonding or restorations to cover exposed roots or repair damaged teeth. 

• Desensitising treatments applied professionally for longer-lasting relief. 

• Advice on diet and oral hygiene tailored to your individual needs. 

Professional care ensures that sensitivity is not a sign of a more serious problem, such as decay or gum disease, and provides longer-lasting results than home care alone. 

Preventing sensitivity involves maintaining strong enamel, healthy gums, and good oral hygiene habits. This includes brushing twice daily with fluoride toothpaste, flossing daily, moderating acidic food intake, and wearing a mouthguard if you grind your teeth. Regular dental check-ups allow early detection of potential issues before they become painful. 

While occasional sensitivity is common, you should book an appointment if you experience: 

• Persistent pain or discomfort 

• Sensitivity accompanied by swelling or bleeding gums 

• Sharp pain when biting or chewing 

• Sensitivity that doesn’t improve with home care 

Early assessment and treatment can prevent minor sensitivity from developing into more serious dental problems. 

Tooth sensitivity can be uncomfortable, but it is manageable with the right approach. Understanding the causes, adopting good oral care habits, and seeking professional advice can relieve discomfort and protect your teeth long-term. 

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