Keethem via Amazon offers the Keethem Coconut Charcoal Teeth Whitening Kit 2-Pack for $15.99. Coupon code "twhite11" cuts that to $4.96. Plus, Prime members receive free shipping. That's $2 under our mention from a week ago, $11 off, and the lowest price we could find. It includes two 2.1-oz. powder toothpastes and two charcoal toothbrushes. Deal ends August 19.