Home Slickdeals Amazon: $20 off Crest 3D White Professional Effects Whitestrips Whitening Strips (22... Slickdeals Amazon: $20 off Crest 3D White Professional Effects Whitestrips Whitening Strips (22 Treatments) – $24.99 + Free Shipping w/Prime By ARCOM - 5 December 2019 130 0 SHARE Facebook Twitter Go to the deal page: Amazon: $20 off Crest 3D White Professional Effects Whitestrips Whitening Strips (22 Treatments) – $24.99 + Free Shipping w/Prime