Print a new coupon to save $0.75 on any one Arm & Hammer toothpaste or Whitening Booster! This month at Walgreens, Arm & Hammer Whitening Boosters are on sale, buy one get one free. The Walgreens coupon policy allows a coupon to be used on a free item, so print and redeem two coupons. The final price is $2.50 each. This is a cheap way to whiten those coffee stains!