Why do my teeth hurt when I eat or drink something cold?

Cold sensitivity is usually caused by exposed dentin — the layer beneath enamel that contains microscopic tubules leading to the tooth's nerve. When enamel wears down or gums recede, these tubules are exposed to temperature changes. The most common causes are enamel erosion from acidic foods/drinks, gum recession from aggressive brushing or gum disease, and teeth grinding.

Do sensitive toothpastes actually work?

Desensitizing toothpastes containing potassium nitrate or stannous fluoride do reduce sensitivity for many patients when used consistently over 4–6 weeks. They work by blocking dentinal tubules or interfering with nerve signal transmission. They treat the symptom, not the cause — if sensitivity is from a cavity or cracked tooth, you still need professional treatment.

When should I see a dentist for tooth sensitivity?

See a dentist if sensitivity is localized to one specific tooth (possible cavity, crack, or abscess), if it persists longer than 30 seconds after the stimulus is removed (nerve involvement), if it came on suddenly and is severe, or if it's accompanied by swelling or spontaneous pain.

Sensitive Teeth: Causes, Treatments, and When to See a Dentist

May 4, 2026

Why Teeth Become Sensitive

Healthy enamel insulates the dentin underneath from temperature changes and pressure. When enamel is compromised or gums recede, the dentin's microscopic tubules are exposed. Fluid movement in these tubules in response to stimuli triggers the sharp, brief pain associated with sensitivity.

Common Causes

Enamel Erosion

Acidic foods and drinks (citrus, soda, sports drinks, wine) dissolve enamel over time. Acid reflux also erodes enamel from the inside. Once enamel is lost, it does not regenerate. Treatment focuses on stopping further erosion and protecting exposed surfaces with fluoride or dental bonding.

Gum Recession

When gums pull back, they expose the root surface, which has no enamel. Root sensitivity is typically sharper and more widespread than crown sensitivity. Causes include aggressive brushing, gum disease, and anatomical factors. Severe recession may require a gum graft.

Teeth Grinding (Bruxism)

Grinding wears down enamel on biting surfaces and can crack teeth over time. Most grinding happens during sleep. A night guard protects teeth from further damage.

Cracked Tooth Syndrome

A crack that doesn't show on X-rays can cause sharp, localized sensitivity triggered by biting on a specific spot. Depending on severity: bonding, a crown, root canal, or extraction.

Treatment Options

Desensitizing toothpaste: First-line for generalized sensitivity. Use consistently for 4–6 weeks.
Fluoride varnish: Applied in-office, effective for 3–6 months.
Dental bonding: Composite resin applied to exposed root surfaces or worn enamel.
Gum graft: For significant gum recession.
Night guard: For bruxism-related sensitivity.

If your sensitivity is localized, worsening, or accompanied by spontaneous pain, find a dentist on The Dentist Ranker.

Frequently Asked Questions

Why do my teeth hurt when I eat or drink something cold?: Cold sensitivity is usually caused by exposed dentin — the layer beneath enamel that contains microscopic tubules leading to the tooth's nerve. When enamel wears down or gums recede, these tubules are exposed to temperature changes. The most common causes are enamel erosion from acidic foods/drinks, gum recession from aggressive brushing or gum disease, and teeth grinding.
Do sensitive toothpastes actually work?: Desensitizing toothpastes containing potassium nitrate or stannous fluoride do reduce sensitivity for many patients when used consistently over 4–6 weeks. They work by blocking dentinal tubules or interfering with nerve signal transmission. They treat the symptom, not the cause — if sensitivity is from a cavity or cracked tooth, you still need professional treatment.
When should I see a dentist for tooth sensitivity?: See a dentist if sensitivity is localized to one specific tooth (possible cavity, crack, or abscess), if it persists longer than 30 seconds after the stimulus is removed (nerve involvement), if it came on suddenly and is severe, or if it's accompanied by swelling or spontaneous pain.