Gluten free. Enamel safe. 2% hydrogen peroxide. Now 2x whitening ingredient (Twice the level of hydrogen peroxide vs. previous Colgate Optic White Advanced). Deeply whitens for up to four shades (When brushing twice daily for six weeks). Goes beyond surface stains with our patented 2% hydrogen peroxide formula. www.colgateopticwhite.com. SmartLabel app enabled. Questions? 1-800-468-6502. Save water. Turn off the tap while brushing. Made in Mexico.