What is activated charcoal toothpaste? My Magic Mud Whitening Toothpaste is the first toothpaste to combine activated coconut shell charcoal and bentonite clay. It is made with smart and wholesome ingredients and is completely fluoride-free and non-GMO. Why use activated charcoal to brush? Because it really works, and the benefits of activated charcoal have been well known for ages. Activated charcoal removes plaque, toxins that cause bad breath, and teeth stains through a process called adsorption where these unwanted elements adhere to the porous surface of the charcoal. The result is a dentist-like clean, and a brighter and whiter smile!