You take a sip of cold water, bite into an ice cream, or drink a hot coffee — and suddenly there’s a sharp, shooting pain in your tooth. Sound familiar? Tooth sensitivity is one of the most common dental complaints we see, and the good news is that in most cases, it is entirely treatable.

In this article, we explain exactly what causes tooth sensitivity, when it’s something minor you can manage at home, and when it’s a sign that you need professional dental care.

What Is Tooth Sensitivity?

Tooth sensitivity — also called dentin hypersensitivity — occurs when the inner layer of your tooth, called dentin, becomes exposed. Dentin contains thousands of tiny channels that lead directly to the nerve of the tooth. When these channels are exposed to temperature changes, sweet or acidic foods, or even air, the nerve responds with pain.

The pain is usually short and sharp, triggered by a specific stimulus, and disappears quickly. This is what distinguishes sensitivity from a toothache, which tends to be more persistent and dull.

What Causes Sensitive Teeth?

There are several common causes:

Enamel erosion — caused by acidic foods and drinks (citrus, fizzy drinks, wine) that wear away the hard outer shell of your tooth over time.
Gum recession — when the gum pulls back from the tooth, it exposes the root surface, which has no protective enamel at all.
Teeth grinding (bruxism) — many people grind their teeth at night without knowing it, slowly wearing down enamel.
Over-brushing — brushing too hard or with a hard-bristled toothbrush damages enamel and irritates gums.
A cracked tooth or filling — even a hairline crack can expose dentin and cause sudden sensitivity.
Tooth whitening products — some bleaching agents can temporarily increase sensitivity.
Tooth decay or a cavity — sensitivity in one specific tooth, particularly to sweet things, is often an early sign of decay.

When Should You See a Dentist?

If sensitivity is new, getting worse, or affecting only one tooth — don’t wait. It is almost always easier and cheaper to treat a dental problem early.

You should book an appointment if:

The sensitivity has appeared suddenly or is worsening
Only one specific tooth is sensitive (this often signals decay or a crack)
The pain lingers for more than a few seconds after the trigger is gone
You also notice visible damage, darkening, or swelling around the tooth
Home treatments have not helped after two to four weeks

What Can You Do At Home?

If your sensitivity is mild and affects multiple teeth, there are some simple steps you can take:

Switch to a toothpaste specifically designed for sensitive teeth — look for ingredients like potassium nitrate or stannous fluoride.
Use a soft-bristled toothbrush and gentle, circular brushing movements.
Reduce your intake of acidic foods and drinks, and rinse with water after consuming them.
If you grind your teeth at night, speak to your dentist about a custom night guard.

How We Can Help

At our practice, we offer a full range of treatments for tooth sensitivity, from professional fluoride applications and dental bonding to gum treatments and custom-fitted mouthguards. Our goal is to find the underlying cause — not just mask the symptom.

If you are experiencing sensitive teeth, we invite you to book a consultation. A short appointment today can save you from a much bigger problem down the line.