Crest mouthwash is on sale at Walgreens for $2.99! Buy four Pro-Health or 3D White bottles and receive a $6.00 Register Reward. The Register Reward will print after checkout and can be used like store credit on a future purchase. Use four $0.75 printable coupons at checkout. The RR plus the coupons stacked on top of the sale price will make the final price of each mouthwash just $0.74!