How long do crest strips last

Crest whitening strips produce a temporary colour change by placing peroxide gel against the enamel, and the result fades as teeth accumulate new stains.

Whitening strips are flexible plastic pieces coated with a peroxide-based gel. The peroxide diffuses into enamel and dentin and breaks down some coloured molecules, while fillings, crowns, veneers, and implants do not bleach in the same way. How long the visible change remains depends on the original stains, diet, tobacco exposure, oral hygiene, enamel characteristics, and whether maintenance treatments are used. The product’s treatment schedule and storage instructions determine how it should be used.

Follow the specific package directions, keep the gel on the teeth rather than the gums, and stop if marked sensitivity or gum irritation develops. A dental examination is useful before whitening when there are cavities, cracks, gum recession, or prominent restorations.

Seek dental care for pain that persists after stopping, a broken tooth, untreated decay, or gum inflammation. Whitening does not treat a dark tooth caused by pulp disease, trauma, or internal staining, which needs diagnosis.

Ask whether the discoloration is external or internal, whether existing restorations will mismatch, and what concentration and wear time are appropriate. Ask how to manage sensitivity and when a replacement or other treatment would be considered.