I was stopped in a large cosmetics store the other day by a tenaceous sales associate, who wanted me to experience a handheld brush device with vibrating bristles that exfoliates the skin. Honestly, the device scared me a little bit, reminded me of an oversized version of my toothbrush, and it made me want to research the process of exfoliation. I set out to clear the air about: what amount of exfoliation, if any, is healthy, and to what degree is it not healthy?