Want to your whiten teeth at home? Crest 3DWhitestrips Professional Effects + 1 Hour Express bonus offering is designed to whiten like a professional-level teeth whitening treatment at-home. The Advanced Seal Technology�s comfortable, no-slip grip means the strips stay put until you take them off, allowing you to talk and even drink water while whitening your teeth. Made by the #1 dentist-recommended at-home teeth whitening brand, Crest 3DWhitestrips Professional Effects will give you a 100% noticeably whiter smile, guaranteed. Using the same hydrogen peroxide whitening ingredient as dentists, this enamel safe at-home teeth whitening kit will make your teeth 20 levels whiter. Simply apply 20 treatments of Crest 3DWhitestrips Professional Effects for 45 minutes a day and 2 treatments of 1 Hour Express for 60 minutes. This pack includes 44 teeth whitening strips, 22 for your top teeth and 22 for your bottom teeth, to be used over the course of 22 days.