Activated charcoal has been observed to absorb a wide range of impurities in the body when ingested, including: • Toxins • Drugs • Viruses • Bacteria • Fungi • Water-Soluble Chemicals Some evidence also exists that activated charcoal is able to absorb plaque and foul odors in the mouth. However, more empirical research is necessary to establish exactly how effective activated charcoal is at absorbing impurities when incorporated in toothpaste.