56 Strips: 28 treatments (each with 1 upper/1 lower). Gently removes years of stains for teeth sensitive to whitening. Enamel safe. Gently removes years of stains. For teeth sensitive to whitening. 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. To learn more about Crest 3D White or get special offers, go to 3DWhite.com. Visit www.3DWhite.com.