Get professional teeth whitening effects right at home with the Crest 3D Whitestrips. With Advanced Seal Technology, they adhere firmly to your teeth, allowing you to talk and even drink water. The professional effects whitestrips use enamel-safe ingredients for safe, better results. Apply a whitening strip on your teeth and let it stay for 30 minutes to get perfect whitening. Their results last for up to 12 months. Available as a pack of 20 and each has an upper and lower strip. Ages 18 and up.