Tooth Sensitivity: Why It Happens and How to Fix It

If a sip of cold water sends a sharp jolt through your tooth, or hot coffee makes you wince, you're dealing with tooth sensitivity. About one in eight adults experience it, and while occasional sensitivity is common and treatable at home, persistent pain is a sign something deeper needs attention. Here is how to tell the difference.

What causes tooth sensitivity?

Tooth sensitivity happens when the protective outer layers of a tooth (enamel and cementum) are worn down or breached, exposing the dentin layer underneath. Dentin contains tiny tubules that lead directly to the nerve, so when something hot, cold, sweet, or acidic touches dentin, it triggers a sharp pain signal. The most common causes are: worn enamel from aggressive brushing or grinding, gum recession exposing the tooth root, a cracked or chipped tooth, untreated cavities, recent dental work (fillings or whitening, usually temporary), or grinding/clenching, especially at night.

What you can try at home first

If sensitivity is mild and recent, these usually help: switch to a sensitive-formula toothpaste (Sensodyne, Colgate Sensitive, etc.) and use it twice a day for at least 2 weeks, they need time to work. Use a soft-bristled toothbrush and brush gently, hard brushing wears enamel and causes recession. Avoid acidic foods and drinks (soda, citrus, wine) or rinse with water afterward. Don't brush immediately after eating acidic foods, wait 30 minutes. Avoid whitening toothpaste if it is making sensitivity worse.

When to see a dentist

Sensitivity that does not improve after 2 weeks of sensitive toothpaste, or sensitivity in one specific tooth, deserves a professional look. Other signs you should not wait on: pain that lingers more than a few seconds after the trigger is removed, pain that wakes you up at night, sensitivity along with visible damage (chip, crack, dark spot) or swelling, sensitivity from sweets (often a sign of a cavity), pain when biting down on the tooth. These can signal a cavity, cracked tooth, or pulp inflammation that needs treatment.

Treatment options at the office

What we recommend depends on the cause. For mild sensitivity, an in-office fluoride varnish or a desensitizing agent applied to the affected teeth can help significantly. For exposed root surfaces, bonding or a gum graft may be appropriate. For a cavity, a filling. For a cracked tooth, often a crown. For grinding-related sensitivity, a custom night guard. For severe sensitivity that signals nerve damage, a root canal may be needed. The first step is always a careful exam to identify the actual cause, that determines the right treatment.

How to prevent sensitivity in the long term

Switch to a soft-bristled toothbrush if you haven't already, and use gentle pressure, let the brush do the work. Try a sensitive toothpaste as your daily toothpaste, even if you don't currently have sensitivity. If you grind your teeth at night, get a night guard. Limit acidic foods and drinks. Get a professional cleaning and exam every 6 months so we can catch small problems before they become big ones.

Does Denti-Cal cover sensitivity treatment?

It depends on what's needed. Routine exams and cleanings (which often address mild sensitivity through cleaning and fluoride) are covered. Fillings, crowns, and root canals when medically necessary are also typically covered. We verify your benefits and write up an estimate before any treatment so there are no surprises. After July 1, 2026, some adults will have Denti-Cal coverage limited to emergency care only, read our Denti-Cal changes guide for details.

Frequently asked questions