My teeth hurt from whitening

Whitening can trigger temporary sensitivity when peroxide reaches dentine, but severe, lingering, or localised pain needs dental assessment.

Peroxide moves through enamel and can irritate fluid-filled dentinal tubules, producing a short sharp response to cold or air. A painful single tooth may instead have decay, a crack, recession, or an existing pulp problem.

Pause whitening, avoid extreme temperatures, and brush gently with a sensitivity toothpaste. Do not place extra gel on one painful tooth or extend the contact time beyond the product instructions.

Arrange care if pain persists after stopping, affects one tooth, occurs without whitening, or comes with a crack, swelling, or spontaneous throbbing. A dentist should check cavities and the pulp before whitening resumes.

Ask whether your enamel, fillings, crowns, gums, and pulp are suitable for whitening. Ask about a lower-strength schedule, custom trays, desensitising measures, and stains that peroxide cannot change.