When you think of putting black toothpaste on your toothbrush, don’t worry about the taste: you aren’t brushing with chunks from your barbecue grill. It may be black, but the charcoal incorporated into the paste is closer to the soft consistency of baking soda. Many charcoal toothpastes also contain flavoring agents, just like any other whitening toothpaste. JADA’s assessment of studies found that many of the toothpastes contained bentonite clay (an allegedly detoxifying ingredient) and that one had betel leaves (a plant chewed as a stimulant in many parts of Asia).
Since many of these toothpastes have not yet been given the American Dental Association’s Seal of Acceptance, you should probably check with your dentist before using any toothpaste containing charcoal. They may want to review the list of ingredients with you or caution you to avoid using a scrubbing motion when brushing since charcoal paste may be more abrasive than your normal toothpaste.