Removes years of stains in just one hour with a comfortable, no-slip whitening experience. Enamel Safe - Crest 3D Whitestrips use the same whitening ingredient as dentists. Need to quickly whiten your teeth at home? No matter what the occasion, all you need is 1 hour to remove years of teeth stains. Made by the #1 dentist-recommended at-home teeth whitening brand, Crest 3D Whitestrips 1-Hour Express will give you a 100% noticeably whiter smile. This enamel-safe, at-home teeth whitening treatment will make your smile 12 levels whiter in just 10 days. Plus, the Advanced Seal Technology is very comfortable, no-slip grip stays put, so you can talk and drink water and chat with friends even while whitening your teeth. Simply apply Crest 3D Whitestrips 1-Hour Express for 60 minutes a day for 10 days. This pack includes 20 teeth whitening strips, 10 for your top teeth and 10 for your bottom teeth, to be used over the course of 10 days.