As crazy as it sounds, this one simple home remedy can really whiten teeth (and help with gum disease) and is also very effective against food poisoning and other types of internal toxins. Activated charcoal is a highly absorbent substance. It removes toxins when they adhere to the surface of the charcoal. It is not absorbed by the body, but passes through the digestive system, so chemicals and toxins adhere to it, pass through the body and are expelled. Activated charcoal is extremely effective at pulling toxins from household chemicals, ingested medicines, and other toxins from the body, especially when taken within 30 minutes of ingestion. For this reason, it is a great first treatment for any kind of poisoning, but should not be taken within several hours of medications that DO need to be absorbed. Activated charcoal is also effective externally as a poultice on spider and insect bites. Activated charcoal is an effective poison remedy, AND is effective at whitening teeth. Although it temporarily makes the mouth look extremely black, it has the same effect as it does when ingested: it pulls toxins from the mouth and removes stains. Activated charcoal can actually be helpful in changing the pH and health of the mouth, and as such is effective in preventing cavities and killing the bad bacteria present in tooth decay and gingivitis. Try opening up a Radiance Activated Charcoal capsule and put it on your toothbrush, taking care as it makes everything black. Quickly put the charcoal covered toothbrush in the mouth ( to protect your sink). Brush in small, gentle circles for 2 minutes, spit carefully and rinse really well. Your mouth will feel amazingly clean. your sink, not so much! However, all of the black washes away and it makes your teeth feel extremely clean and smooth. After a few uses, your teeth will be noticeably whiter.