Stock up on Colgate Optic White toothpaste this week at Walgreens! Use the 8/24 Smart Source coupon listed below to pay $2.49. Then receive a $2.00 Register Reward at checkout. Register Rewards are coupons that print at checkout after you make a qualifying purchase. They are good for a dollar amount off your next in-store purchase. After the Register Reward, the grand total for the toothpaste is $0.49!