20 strips: 10 treatments (each with 1 upper/ 1 lower). 20 strips: 10 treatments (Each with 1 upper/1 lower). Visibly whitens teeth in just days. Anti-theft program. Visibly whitens teeth in just days with a comfortable no-slip whitening experience. 100% satisfaction Guarantee. Satisfaction guarantee Crest Whitestrips provide you with a beautiful, whiter smile - guarantee. If you are not satisfied with your results, Crest 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. Call 1-800-208-0169 for more information. www.crest.com/whiestrips. www.pg.com. To learn more about Crest Whitestrips or get special offers, go to www.crest.com/whiestrips. Questions? Call 1-800-395-8423 or visit www.crest.com/whiestrips.