How long do you keep crest strips on

These are flexible plastic whitening strips coated with a peroxide-based bleaching gel. The gel contacts the outer enamel surface and chemically breaks down some tooth discoloration while the strips are held against the teeth.

Read the wear-time instruction on your exact box because Crest makes several strip strengths and schedules. Apply the strips to clean, dry teeth without pushing gel onto the gingival margin, then remove them when the stated time ends and rinse or brush gently if gel remains.

Do not leave a strip on overnight or extend the session to whiten faster. If you notice sharp sensitivity, persistent gum irritation, or a burning feeling, remove the strips and stop further applications until a dentist has assessed the cause.

Arrange a dental examination if pain or gum soreness continues after the strips are removed, or if whitening reveals a dark spot, a crack, a filling, or a crown that does not change color. Whitening gel changes natural enamel color but does not whiten fillings, crowns, veneers, or other dental restorations.

A dentist should also check untreated cavities, exposed root surfaces, and inflamed gums before you continue whitening, because the gel can irritate these areas and the underlying problem needs separate treatment.

Ask whether your tooth color is caused by surface stain or a deeper change inside the tooth, and whether any cavities, gum recession, enamel wear, fillings, or crowns will affect the result. Ask which whitening method and wear schedule fit your teeth if the strips cause sensitivity.