School of Ayurvedic Diet & Digestion
Teeth should be a bright white. If they appear yellowish or gray, that is also a sign of toxins. To be thorough, check the color of the back of the throat and the underside of the tongue as well. Even if you don't know what the signs means, check your tongue in the mirror every day.
To keep your mouth healthy, brush your teeth, floss, and scrape your tongue every day. Avoid foods that leave a bad taste in your mouth 20 minutes later. Avoid chewing gum.