Fluoride is a naturally-occurring mineral, not an artificial compound or medication like it is sometimes perceived to be. Fluoride is found in fresh and salt water, vegetables and grains, rocks and soil. This naturally occurring mineral plays a critical role in strengthening your teeth to fight off the effects of decay. The Australian Dental Association state that fluoride found in the environment however is not enough on its own to protect your teeth. This is why small supplemental amounts are added to the water supply and toothpaste. Celia | Hygienist.