How to Stop Sensitive Teeth

Sensitive teeth are usually caused by exposed dentine, enamel wear, gum recession, tooth decay, cracks, grinding or recent dental treatment. Mild sensitivity may improve with desensitising toothpaste, a soft toothbrush, fluoride and changes to diet or brushing habits. However, sensitivity that is severe, sudden, one-sided, painful when biting, lingering after hot or cold, or linked with swelling should be checked by a dentist.

Teeth become sensitive when the protective outer layers of the tooth no longer fully shield the dentine underneath. Dentine contains tiny tubules that can transmit temperature, touch or chemical changes towards the nerve inside the tooth.

The most common causes are gum recession, enamel wear, tooth decay, cracked teeth, recent dental treatment, grinding or gum disease.

There are several reasons why teeth can become sensitive. Some are linked to the tooth surface, while others are caused by the gums, bite, nerve or previous dental treatment. Understanding the cause matters because sensitive toothpaste may help with exposed dentine, but it will not fix a cavity, crack or infection.

Gum recession

Gum recession happens when the gum moves away from the tooth, exposing part of the root surface. Tooth roots are not protected by enamel, so they can feel more sensitive to cold, brushing and touch.

Recession may be linked to gum disease, brushing too firmly, tooth position, previous orthodontic treatment, grinding or natural gum shape. A dental hygienist can help assess whether sensitivity is linked to plaque build-up, gum inflammation or brushing technique.

Enamel wear and acid erosion

Enamel can gradually wear down through acidic foods and drinks, reflux, grinding, clenching, abrasive toothpaste or brushing too aggressively. As enamel becomes thinner, teeth may react more strongly to cold, sweet or acidic foods.

Frequent fizzy drinks, citrus fruits, fruit juices, wine, vinegar-based foods and sports drinks can contribute to acid erosion, especially when consumed often throughout the day. Grinding or clenching can also cause tooth wear, which may make sensitivity worse over time.

Tooth decay

Tooth decay can cause sensitivity to cold, sweet foods or food getting stuck around a tooth. In the early stages, the discomfort may be mild and occasional. As decay gets deeper, the pain may become stronger, last longer or develop into toothache.

A small cavity may need white fillings. Deeper decay may need root canal treatment if the nerve inside the tooth becomes inflamed or infected.

Cracked or chipped teeth

A cracked tooth can cause sensitivity to cold, sweet foods or biting pressure. Some patients notice a sharp pain when biting down or when they release the bite.

Cracks are not always visible at home. They are more common in teeth with large fillings, worn teeth, heavily restored teeth or teeth affected by grinding. Depending on the crack, treatment may involve bonding, an onlay, dental crowns, root canal treatment or, in more severe cases, extraction.

Grinding and clenching

Grinding can overload the teeth, wear down enamel and create small cracks. It may also make teeth feel tender or sensitive, especially in the morning.

Other signs can include jaw ache, headaches, chipped edges, worn teeth or a tight feeling around the jaw. A custom night guard may help protect the teeth if grinding is contributing to sensitivity or tooth wear.

Recent dental treatment or whitening

Sensitivity can happen after fillings, crowns, veneers, whitening, hygiene treatment or other dental procedures. This is often temporary, especially if the tooth or gum has recently been treated.

However, worsening sensitivity, pain when biting or pain that lingers after hot or cold should be reviewed. This may mean the bite needs adjusting, the tooth is inflamed, or there is another underlying problem. If sensitivity starts after teeth whitening, your dentist may recommend pausing treatment, adjusting the whitening plan or using desensitising support.

A dentist will first check what is causing the sensitivity. This may include looking for gum recession, enamel wear, decay, cracks, loose fillings, bite problems, grinding, gum disease or signs that the nerve inside the tooth is inflamed.

Treatment may include fluoride varnish, desensitising products, bonding, fillings, bite adjustment, gum treatment, night guards, crowns or root canal treatment depending on the cause.

The right treatment depends on the diagnosis. Sensitive toothpaste may reduce symptoms, but it should not be used to mask pain that is getting worse.

Sensitive teeth can improve if the cause is mild exposed dentine, temporary whitening sensitivity, recent hygiene treatment or minor irritation. Many patients notice improvement after using desensitising toothpaste consistently and changing brushing or diet habits.

Sensitivity is less likely to go away on its own if it is caused by decay, a crack, gum disease, severe recession, a leaking filling, an infected tooth or ongoing grinding. If symptoms continue or keep returning, a dentist can check whether treatment is needed.

Preventing sensitivity depends on the cause, but good daily habits can reduce the risk of enamel wear, gum recession and decay.

Helpful steps include:

• brushing twice daily with fluoride toothpaste
• using a soft toothbrush
• cleaning between the teeth daily
• avoiding aggressive brushing
• reducing frequent acidic drinks and snacks
• avoiding abrasive toothpaste
• wearing a custom night guard if you grind your teeth
• keeping up with regular dental check-ups
• seeing a dental hygienist for gum health support
• treating gum disease early

The aim is not just to reduce sensitivity, but to protect the teeth and gums from further damage.

If your sensitivity is mild and affects several teeth, you can start with sensitive toothpaste, a soft toothbrush and reducing frequent acidic foods or drinks. Give it a few weeks, unless the pain is severe or getting worse.

If the sensitivity is sudden, one-sided, painful when biting, lingering after hot or cold, or linked with swelling, it is better to arrange a dental assessment. A dentist can check whether the problem is exposed dentine, gum recession, decay, a crack, grinding or infection.

If you are based near Highgate or North London, Pond Square Dental can assess the cause of sensitive teeth and explain the most suitable treatment options.

Sensitive teeth are common, but the cause matters. Mild sensitivity may improve with desensitising toothpaste, fluoride toothpaste, a soft toothbrush and changes to brushing or diet habits.

Sensitivity should be checked if it is sudden, severe, localised to one tooth, painful when biting, lingering after hot or cold, or linked with swelling. In those cases, treatment depends on whether the cause is exposed dentine, gum recession, decay, a crack, grinding, gum disease or infection.

A dental assessment can help identify the cause and prevent the problem from becoming more difficult to treat.

Why are my teeth sensitive to cold?

Cold sensitivity is often caused by exposed dentine, gum recession, enamel wear, decay or a crack. If it affects several teeth and stops quickly, it may be general sensitivity. If it affects one tooth or lingers, book a dental check-up.

Can sensitive teeth mean I need a filling?

Yes, sensitive teeth can mean you need a filling if the sensitivity is caused by tooth decay or a damaged filling. Sensitivity to sweet foods, cold drinks or food getting stuck can sometimes suggest a cavity that may need white fillings.

Can sensitive teeth mean I need root canal treatment?

Sometimes. Root canal treatment may be needed if the nerve inside the tooth is inflamed or infected. Warning signs include lingering pain, heat sensitivity, spontaneous pain, swelling or pain when biting.

Can whitening make teeth sensitive?

Yes, teeth whitening can cause temporary sensitivity. This often improves when whitening is paused or adjusted. If sensitivity is severe or persistent, speak to your dentist before continuing.

Can a hygienist help with sensitive teeth?

Yes, a dental hygienist can help if sensitivity is linked to gum recession, plaque build-up, gum inflammation or brushing technique. They can also advise you on cleaning around sensitive areas without making the problem worse.

Is tooth sensitivity an emergency?

Mild sensitivity is not usually an emergency. It may need emergency dental care if there is swelling, severe pain, trauma, fever, difficulty swallowing, difficulty breathing or pain that cannot be controlled.