28-Pack Crests 3D Whitestrips Gentle | $20 | Amazon | Clip the $15 coupon

Let’s say you’ve already upgraded to a good toothbrush; what’s the next step for cleaner teeth? Well, this 28-treatment box of Crest 3D Whitestrips is a great place to start. Just be sure to clip the $15 coupon before you check out to get them for $20, one of the best per-treatment Whitestrip deals we’ve ever seen.