The ultimate teeth whitening product from the teeth whitening powerhouse, America. Easy home whitening, just apply for 30 minutes a day! Easy whitening at home! Unreleased in Japan, the popular Crest 3D White Strips [Product Contents] Crest 3D Whitestrips 20 treatments x 1 box (upper and lower strips in one packet) Brand: Crest - Model Name: 3D Whitestrips - Contents: 40 strips (20 treatments) - How to use: Use once a day for 30 minutes - Effect: Professional level whitening - Features: Enamel safe