Why Are My Teeth Sensitive— Common Causes and What Helps

That sharp, brief pain when you eat or drink something cold, hot, or sweet — tooth sensitivity is one of the most common dental complaints, affecting millions of people. It’s often dismissed as “just how my teeth are,” but sensitivity is almost always a signal that something has changed in your teeth or gums. Here’s what’s usually behind it and what you can do.

The Root Cause: Exposed Dentin

The outer layer of your teeth is enamel — a hard, protective coating. Beneath the enamel is dentin, a softer tissue full of microscopic tubules that connect to the nerve inside the tooth. When dentin is exposed — through enamel erosion, receding gums, or a crack — these tubules are open to temperature changes, pressure, and acidic or sweet foods. The result is that sharp, brief sensitivity pain.

Common Causes of Sensitivity

Gum recession is one of the most frequent culprits, especially in older adults. When gums pull back from the teeth (from gum disease, aggressive brushing, or natural aging), root surfaces become exposed. Roots have no enamel protection, making them highly sensitive.

Enamel erosion from acidic foods and drinks gradually wears away the enamel layer. Tooth grinding (bruxism) does the same — wearing down enamel from the biting surfaces. A cracked tooth creates a pathway to the inner nerve that triggers sharp sensitivity. Tooth decay, of course, can also cause sensitivity as it approaches the nerve.

Sensitivity can also temporarily follow dental procedures like cleanings, whitening, or fillings — this usually resolves within a few days to weeks.

Sensitivity Toothpastes: Do They Work—

Sensitivity toothpastes (Sensodyne and its competitors) do work — but they work slowly and require consistent use. They contain compounds (potassium nitrate or stannous fluoride) that either block the tubules in dentin or desensitize the nerve over time. Use them as your regular toothpaste, and expect several weeks before you notice significant improvement.

They mask the symptom but don’t treat the underlying cause. Persistent or worsening sensitivity needs a dental evaluation.

What Your Dentist Can Do

For more severe sensitivity, dentists can apply desensitizing agents directly to affected areas, place protective bonding over exposed root surfaces, prescribe high-fluoride treatments, or address underlying issues like cavities or cracked teeth. If you have sensitivity that isn’t improving, don’t just live with it — it’s likely getting worse and can be treated.

Ready to schedule— Call Smiles by Delivery at 623-584-4746 or visit smilesbydelivery.com