Colgate optic white renewal lasting fresh whitening toothpaste with 3% hydrogen peroxide that 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? 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 tooth paste. - remove 10 years of yellow stains with the whitening ingredient dentists use. - proven to deeply whiten beyond surface stains. - enamel safe for daily use.