Sensitive Teeth: Why It Happens and How to Find Relief

August 25, 2026

Medically reviewed by the clinical team at Royce Dental Group.

That sharp twinge when you sip something cold, bite into ice cream, or breathe in cool air is tooth sensitivity, and it is one of the most common dental complaints. Sensitive teeth happen when the protective outer layer of a tooth wears down or the gum pulls back, exposing the softer part underneath that connects to the nerve. The good news is that most cases are manageable once you know the cause. This guide explains what triggers sensitivity, what you can do at home, and when it is worth seeing a dentist.

What is tooth sensitivity?

Tooth sensitivity is a short, sharp pain in one or more teeth in response to something hot, cold, sweet, or acidic. It happens when the hard enamel on the crown of the tooth, or the gum covering the root, wears away and exposes the layer beneath called dentine. Dentine contains tiny channels that lead to the nerve, so when it is exposed, everyday triggers can reach the nerve and cause that familiar zing.

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What causes sensitive teeth?

Brushing too hard, or using a stiff brush, which wears away enamel over time.
Gum recession, where the gum pulls back and exposes the root surface. You can read more in our guide on receding gums and how to treat them.
Acidic food and drink, such as citrus, soft drinks, and juices, which soften and erode enamel.
Tooth decay, a cracked tooth, or a worn filling, which can expose the sensitive inner tooth.
Teeth grinding or clenching, which wears down enamel and stresses the teeth.
Gum disease, which can expose roots and inflame the surrounding tissue. Our article on gum (periodontal) disease covers the warning signs.
Recent dental work or whitening, which can cause temporary sensitivity that settles on its own.

Why do my teeth hurt with cold, hot, or sweet things?

These triggers reach the nerve through exposed dentine. When enamel or gum no longer covers the tooth fully, hot, cold, sweet, and acidic stimuli travel down the tiny channels in the dentine to the nerve inside. That is why the pain tends to be sudden and sharp, and why it usually stops soon after the trigger is removed. Pain that lingers or throbs is a different signal, and is worth getting checked.

How can I relieve sensitive teeth at home?

Use a toothpaste made for sensitive teeth. These contain ingredients that calm the nerve response, and they work best used consistently rather than now and then.
Switch to a soft-bristled brush and ease off the pressure. Let the bristles do the work rather than scrubbing.
Cut back on acidic food and drinks, and rinse with water afterwards. Avoid brushing straight after something acidic, since enamel is softer then. Wait about 30 minutes.

When should you see a dentist about sensitive teeth?

See a dentist if the sensitivity is strong, focused on one tooth, or does not improve after two to three weeks of home care. Sensitivity in a single tooth, pain that lingers or throbs, or a twinge you can trace to a hole, chip, or rough spot can point to decay, a cracked tooth, an exposed root, or a nerve problem. These need a proper diagnosis rather than home care alone, because treating the underlying cause is what actually resolves the pain.

How do dentists treat sensitive teeth?

Treatment depends on the cause, which is why an examination matters. A dentist may recommend:

Fluoride application to strengthen enamel and reduce the nerve response.
A filling or bonding to cover an exposed or worn area.
A dental crown to protect a cracked or heavily worn tooth.
Gum treatment if recession or gum disease is exposing the roots.
A root canal if the sensitivity comes from an inflamed or infected nerve and other treatments are not enough.
A night guard if grinding is wearing the teeth down.

If your sensitivity started after teeth whitening, it is usually temporary, and a dentist can advise on gentler options if it keeps happening.

How can I prevent sensitivity coming back?

Prevention comes down to protecting your enamel and gums:

Brush gently twice a day with a soft brush and fluoride toothpaste.
Keep acidic food and drinks in check, and rinse with water afterwards.
Do not ignore grinding, gum bleeding, or a tooth that feels rough or chipped.
Keep up regular check-ups so small problems are caught before they become painful.

You can find your nearest clinic on our locations page, read about our dentists, or book an appointment if your teeth have been bothering you.

Frequently asked questions

Why are my teeth suddenly sensitive?

Sudden sensitivity is often from enamel wear, gum recession, a cracked tooth, or recent dental work or whitening. If it appears in one tooth and lingers, have it checked, since it can signal decay or a nerve issue.

Does sensitive-teeth toothpaste actually work?

For many people, yes, but it works gradually. Use it consistently for at least two to three weeks. If there is no improvement, the cause may need a dentist's attention.

Can sensitive teeth heal on their own?

Temporary sensitivity after whitening or a dental visit usually settles by itself. Sensitivity from decay, a crack, or gum recession will not resolve on its own and needs treatment.

Is tooth sensitivity a sign of something serious?

Often it is simply worn enamel or exposed roots. But persistent, sharp, or throbbing pain in one tooth can indicate decay or a nerve problem, so it is worth getting checked.

How can I brush without making sensitivity worse?

Use a soft-bristled brush, apply light pressure, and avoid brushing straight after acidic food or drink. Aggressive brushing is a common and avoidable cause of sensitivity.

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