12 hr stain protection. Our most advanced whitening technology (Among single-tube toothpastes). + advanced stain protection. Enamel safe whitening. Satisfaction Guaranteed: Crest 3D Whie toothpaste will provide you with a whiter smile - guaranteed. If you are not satisfied with your results, Crest 3D White toothpaste will send you a pre-paid card in the amount of your purchase. Simply return your receipt and package UPC within 60 days of purchase. Limit to one refund per person. Call 1-800-208-0169 for more information. www.pg.com. www.crest.com.