Crest 3D Whitening Luxe Strips bring you a bright smile quite and safe. The Advanced Seal Technology allows for no-slip to make sure your teeth getting whitened quickly. Apply strip and they stay in play while you continue your day. Safe on enamel and start seeing results in as little as 3 days! These advances whitening strips can remove years of stains and penetrate below the surface for visible results. Pack sizes vary for your needs! Use once a day for 30 minutes!