Crest 3D White Classic Vivid Whitening Strips help you achieve visibly whiter teeth in just 30 minutes a day. With consistent use for 10 days, you can reverse years of staining. These thin, flexible strips are coated with a whitening gel that uses the same enamel-safe whitening agent dentists use. They are designed to conform to the shape of your teeth, keeping the whitening gel in place to effectively remove stains on and below the tooth's surface. Ingredients PVP PEG-8 Water Hydrogen Peroxide Acrylates Copolymer Sodium Hydroxide Sodium Saccharin Suggested Use> Peel the strip from the backing liner Apply the gel side to your teeth, aligning with the gum line Press gently to ensure good contact Fold the remainder of the strip behind your teeth Leave on for 30 minutes Remove and discard the strip after use Use once daily for 10 days Note: It is best not to brush your teeth immediately before applying the strips. If you experience tooth sensitivity, try reducing usage to every other day. Consult your dentist if sensitivity persists. This product is designed to whiten natural teeth only and will not whiten caps, crowns, veneers, fillings or dentures.