Misc: Enamel safe whitening. 3 benefits in 1. Removes up to 80% of surface stains. 3 - in - 1 Benefits: Whitens; strengthens (strengthens enamel); protects (against future stains). www.pg.com. www.crest.com. Satisfaction Guaranteed: Crest 3D White will provide you with a whiter smile - guarantee. If you are not satisfied with your results, Crest 3D White 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.