Cold sensitivity in teeth is caused by worn enamel, receding gums, cavities, or cracks that expose the nerve-filled dentin underneath.
Causes
- Worn enamel.
- Receding gums that expose roots.
- Cavities.
- Cracked tooth.
- Teeth grinding.
- Recent whitening.
- Acidic foods and drinks.
Relief
- Desensitizing toothpaste with potassium nitrate.
- Soft brush.
- Fluoride rinse.
Prevention
Avoid brushing hard.
See a dentist
If sensitivity is sharp or persistent.
Why cold hurts teeth
Dentin hypersensitivity happens when dentin, the layer beneath enamel, is exposed. Microscopic tubules in the dentin lead to the nerve, and cold fluid movement in these tubules triggers a sharp pain. Gum recession, enamel wear, cracked teeth, cavities and recent whitening or dental work all cause exposure.
- Roughly 1 in 8 adults report tooth sensitivity, with estimates up to 30 percent in some studies.
- Brushing too hard, acidic foods and drinks, and tooth grinding wear enamel.
- Lingering pain after cold may signal pulp inflammation, which could need a root canal.
Relief and prevention
Use desensitizing toothpaste with potassium nitrate or stannous fluoride for 2 to 4 weeks, brush gently with a soft brush, and avoid acidic drinks. A dentist may apply fluoride varnish, sealants or bonding, or recommend a gum graft. Wear a night guard if you grind. See a dentist for pain that lingers more than 30 seconds, wakes you at night or comes with swelling.
Why cold hurts teeth
Dentin hypersensitivity occurs when enamel wears or gums recede, exposing dentin tubules that carry fluid movement to nerves. Cold triggers sharp pain. Causes include brushing too hard, acidic foods, grinding, cavities and cracks. About 1 in 8 adults has sensitive teeth.
Relief and prevention
Use desensitizing toothpaste with potassium nitrate or stannous fluoride, a soft brush and avoid acids. See a dentist for pain that lingers, which may signal decay or a cracked tooth.
Enamel and dentin biology
Enamel is the hardest tissue in the body but thins with acid erosion and abrasion. Dentin contains tubules, around 20,000 per square millimeter, that transmit fluid movement from cold to the nerve (hydrodynamic theory). Gum recession exposes root surface, with roots lacking enamel.
Reducing sensitivity
Use toothpaste with 5 percent potassium nitrate or stannous fluoride for 4 weeks, and avoid whitening strips if sensitive. In office treatments include fluoride varnish, bonding and sealants. Soft brushing, not brushing right after acid, and mouthguards for grinding help. Persistent lingering pain may signal a cavity or cracked tooth.
Based on data from the American Dental Association
