Used since the 1800s - all natural, micronized activated charcoal helps brush and remove surface stains from coffee, tea, red wine, smoking or other daily dulling activities. Less abrassive than most toothpastes in drugs stores and completely safe if accidentally ingested. Dip your brush in water than mixture andd brush normally. can whiten multiple shades per use with no sensitivity. Suggested use 2-3 times a week for best results.