Do teeth whitening strips hurt enamel

Peroxide moves through enamel and dentine to break down some stain molecules. Enamel is not a coloured coating that can be peeled away, but excessive contact, a poorly fitting strip, high concentration, or use on damaged teeth can increase irritation and sensitivity.

Follow the product directions, keep strips off the gums, do not combine whitening products, and stop if burning or significant pain develops. A dental examination should come first when there are cavities, cracks, enamel wear, exposed roots, gum disease, or existing sensitivity.

Seek dental care for persistent sensitivity, gum whitening or peeling, severe pain, or symptoms from swallowing a product. Do not continue whitening over untreated decay or a damaged restoration.

Ask whether your enamel and gums are healthy enough for whitening, which concentration and contact time apply, how to protect exposed roots, and whether your fillings or crowns will remain a different shade.