How long it takes to whiten teeth

Teeth whitening may brighten teeth during a home course or an in-office visit, but the visible result depends on the stain, method, and tooth condition.

Whitening uses a peroxide compound to break down pigment molecules within enamel and dentine. Surface stains respond differently from internal discoloration caused by injury, medication, enamel defects, or loss of pulp vitality.

A dentist first checks for decay, gum inflammation, cracks, restorations, and the type of discoloration. The method may use custom trays with peroxide gel at home or a professionally controlled gel in the clinic.

Have an examination before whitening if you have untreated decay, bleeding gums, strong sensitivity, or darkening of one tooth. Return for review if pain persists or the color change is uneven.

Ask what caused the discoloration, how quickly the method should show a change, whether restorations will change color, and how sensitivity will be managed.