8 Strips: 4 treatments (each with 1 upper/1 lower). Removes years of stains in just one hour. Enamel safe. Removes years of stains in just 1 hour. Advanced Seal Technology provides a strong grip that molds and adheres to your smile for a comfortable, no slip whitening experience. Enamel Safe: All Crest 3D White Whitestrips use the same enamel safe whitening ingredient as the dentist. Satisfaction guaranteed. Crest 3D White Whitestrips provide you with a beautiful, whiter smile - guaranteed. If you are not satisfied with your results, Crest will refund your purchase price. 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. To learn more about Crest 3D White or get special offers, go to 3DWhite.com. Questions: Call 1-800-395-8423 or visit www.3DWhite.com. Patents: www.pg.com/patents.