Brush It On - Activated Charcoal Tooth Powder100% natural activated charcoal teeth whitening powder helps absorb plaque and other compounds that stain your teeth. One reusable metal jar contains 40 grams of a mint flavoured tooth powder which allows for approximately 70 uses. Activated charcoal is a finely milled black powder made from coconut shells. The charcoal is processed with high heat, which activates it. This changes its internal structure, making it more porous than regular charcoal.