About this item Crest’s best and fastest whitening technology at home A lightweight, disposable, water resistant, handheld device that weakens stains When used as directed, Crest Whitestrips with Light whitens dramatically better than strips alone Whitening results last up to 36 months. Apply light to upper and lower teeth until it turns off automatically. Full results in 10 days 1 Light and 10 teeth whitening strip treatments, each with 1 upper and 1 lower strip. Apply once a day for 60 minutes
