Teeth whitening makes teeth sensitive

Whitening sensitivity occurs when peroxide stimulates dentinal tubules; it is managed by changing exposure and treating contributing tooth problems.

Dentinal tubules connect the outer tooth surface with the pulp. When enamel is thin or dentine is exposed by recession, wear, cracks, or decay, whitening gel can trigger a brief sharp response to cold or air.

Pause whitening if the response is strong, use a soft brush, and ask about a desensitising toothpaste. A dentist may reduce gel strength or contact time and treat decay, cracks, recession, or worn enamel first.

Arrange an examination when sensitivity is severe, lasts beyond the whitening session, affects one tooth, or occurs without a trigger. Lingering heat or cold pain can indicate pulp inflammation rather than simple sensitivity.

Ask whether the sensitivity is from exposed dentine or an underlying problem, and which desensitising plan fits your teeth. Ask when it is appropriate to resume whitening.