How to reduce tooth sensitivity from whitening

Peroxide whitening gel can move through enamel toward dentine, where fluid movement in tubules stimulates the pulp nerve. Exposed roots, cracks, cavities, worn enamel, and strong or prolonged gel exposure can make the response more noticeable.

Stop or space out whitening until the discomfort settles, use a toothpaste containing fluoride or potassium-based desensitising ingredients, and avoid very cold or acidic foods. A dentist can check for decay, cracks, leaking fillings, gum recession, and the concentration and fit of the whitening tray.

Arrange an examination if pain is intense, lasts after whitening stops, affects one tooth, or occurs without temperature triggers. Urgent care is needed for swelling, spontaneous throbbing, or pain that prevents sleep.

Ask whether the sensitivity is expected for the product or signals decay, a crack, recession, or pulp inflammation. Ask about a lower concentration, shorter contact time, tray adjustment, and whether whitening should wait.