Crest 3D White Whitestrips With Advanced Seal Professional Effects Enamel Safe Dental Whitening Kit 20 Pouches 40 Total Strips Professional Level Whitening Results last up to 12 months. Featuring Advanced Seal Technology, these no-slip Whitestrips allow you to talk, drink water and go about your day while you whiten with no sticky mess. Use for 30 minutes, once a day for a stand-out smile. Plus, you'll start seeing results after just 3 days. Full results after completion of kit. Crest's; best at-home whitening is as effective as 500 Dollar in-office whitening treaents. Provides professional level whitening. Results last up to 12 months Advanced Seal technology allows you to talk, drink water and go about your day while you whiten and the Whitestrips; won't slip or leave behind messy residue Enamel safe and easy application. Same whitening ingredient dentists use Start seeing a whiter smile after just 3 days Longer bottom strip is designed to reach more teeth for better coverage Fits ea