Colgate Optic White Renewal Lasting Fresh Teeth Whitening Toothpaste removes 10 years of yellow stains, with twice-daily brushing for 4 weeks. Did you know that yellow stains, as well as other types of stains, can build up on the inside as well as the outside of your teeth? Colgate Optic White Renewal contains 3% hydrogen peroxide, which is clinically proven to whiten your teeth inside and out. Take years off your smile with Colgate Optic White Renewal. - Remove 10 years of yellow stains* - Powered by Hydrogen Peroxide, the whitening ingredient dentists use - Proven to deeply whiten beyond surface stains - Enamel safe for daily use *with Twice daily brushing for 4 weeks. Individual results may vary. Colgate Optic White toothpastes contain hydrogen peroxide. Hydrogen peroxide works by removing extrinsic and intrinsic stains. Other whitening toothpastes use high cleaning silica, which helps to remove surface stains on the outer layer of the teeth.