Misc: Whitelock technology. Strengthens enamel & removes up to 90% of surface stains in 1 week. Enamel safe whitening. Strengthens enamel, whitens teeth, & fights cavities. Locks out future stains even in the fine lines of your teeth. For an extra white smile, use the 3D White collection of products. www.pg.com. www.crest.com. Satisfaction Guaranteed: Crest 3D White 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.