Gluten free. Enamel safe. 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). 2% hydrogen peroxide. Some people may experience tooth sensitivity or gum discomfort tooth sensitivity or gum discomfort when using whitening products. This discomfort is temporary and not harmful. If you experience more than mild tooth sensitivity, stop use and consult your dentist. www.colgateopticwhite.com. Smartlabel. App enabled scan for more information. Questions? 1-800-468-6502. Save water. Turn off the tap while brushing. Made in Mexico