Colgate Optic White Pro Series Enamel Renewal Toothpaste clinically proven formula contains Hydrogen Peroxide, the same whitening ingredient used by dentists. Plus, innovative ActivShine Technology polishes the enamel surface to reveal next-level shine.Pro Series Enamel Renewal Toothpaste is designed for no tooth sensitivity and dissolves deep-set stains without weakening enamel. It’s the enamel-safe way to get visibly whiter teeth in 3 days**.With this mint toothpaste, there’s no need to choose between having a bright smile and safeguarding your enamel. Pro Series Toothpaste starts whitening after the first brush. That’s thanks to its dual-action teeth whitening formula, which brushes surface stains away while dissolving the tough stains beneath. 85% of people notice a positive difference in their teeth in 7 days when used as directed. After two weeks, this teeth whitening toothpaste removes 15 years of stains**. **when brushing twice daily for 2 weeks