Get visibly whiter teeth in just days. Crest 3D Whitestrips Noticeably White makes it easy to whiten teeth and reveal a brighter smile. Using the same enamel-safe whitening ingredient as dentists use, your smile will be visibly whiter in just days. Peel Whitestrips from back liner. Using a mirror, apply gel side of strip to front teeth. Align straight edge of strip with gumline. Fold over teeth and press to secure. For teeth sensitive to whitening, effects are generally mild. If sensitivity or gum discomfort develops, stop usage for 2 days and then resume usage. Strips will not whiten caps, crowns, veneers, fillings or dentures. #1 Dentist recommended at home whitening kit brand. Satisfaction Guaranteed - If you are not satisfied with your results, Crest will send you a pre-paid card in the amount of your purchase. Simply return your receipt and package UPC within 60 days of purchase. Limit to one refund per person. Call 1-800-208-0169 for more information.