Unleash a brilliantly dimensional smile with Crest 3D White Supreme FlexFit Whitestrips. They whiten as well as a $500 professional laser treatment to give you a megawatt smile. These Whitestrips bring the power of professional whitening to your home so you can get a brilliant smile quickly and easily. Our exclusive FlexFit technology allows these strips to stretch, covering 30% more of your smile vs. a non-flexing strip. 24 Levels Whiter in just 3 Weeks, Professional-level whitening removes over 25 years of stains, Canadian Dental Association Validated, Uses the same whitening ingredient as dentists, Enamel Safe & Effective, Features our Advanced Seal Technology no-slip grip so strips stay put during full application time USE ONCE A DAY FOR 1 HOUR 1) Peel, 2) Stretch & Apply, 3) Reveal your whiter smile PVP, PEG-8, Water, Hydrogen Peroxide, Acrylates Copolymer, Sodium Hydroxide, Sodium Saccharin.