Why pay for Professional teeth whitening treatments? Crest 3D White Whitestrips Professional Effects is just as effective, These whitestrips are formulated with the same enamel-safe ingredient dentists use, Apply once a day for 30 minutes, Youll start seeing a whiter smile after three days, with full results in 20, Pack: 24, Dimensions: 21L x 4H x 9W, SKU: ORLB012