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. Go beyond surface whitening, to a radiant smile that shines from the inside out. Use: aids in the prevention of dental cavities.