Other Information: Store at 68-77 degrees F (20-25 degrees C). Misc: Peroxide toothpaste formulated for superior whitening. Whitens deeper (Active Dental Peroxide - the same enamel-safe whitening ingredients that dentists use) & restores enamel. Go beyond surface whitening, to a radiant smile that shines from the inside out. Tooth discoloration is caused by two types of stains - surface stains, and deep stains. Unlike most whitening toothpastes, which only whiten on the surface, this daily-use deep whitening formula is expertly designed to provide double the whitening action: On the Surface: gently polishes away surface stains, without scratching the enamel; Below the Surface: safely whitens below the enamel to help remove deep stains where they start. Specially Formulated with Proven Ingredients: Active Dental Peroxide - the same enamel-safe whitening ingredient that dentists use; Fluoride - to actively restore and strengthen enamel. Make a whiter, brighter smile part of your daily routine. Visit www.rembrandt.com. Formulated for superior daily whitening. Questions or comments? 1-800-548-3663; www.rembrandt.com. This proprietary formula contains active dental peroxide which releases oxygen for superior whitening. As a result, it is common for the tube to appear slightly inflated or release air when opened.