LEFT NAVIGATION BAR Home Fluoride History Current News Water Fluoridation Who Supports Fluoride Anti-Fluoride MisInformaiton Fluoride Factoids Top Ten Facts Kids & Fluoride Are Caveties A Problem Effectiveness of Fluoride Alternatives Safety F.A.Q.s Articles Resources Government Agencies Non-Governmental Sites Contact Us Fluoride. Water Fluoridation Why We Add Fluoride to Water: The natural fluoride in a communitys water supply sometimes is not at the optimal level to prevent tooth decay and so we have to adjust it for the greatest benefit to all. The acceptable level ranges from 0.7 1.2 parts fluoride to one million parts water. Over 300 million people in more than 40 countries worldwide enjoy the benefits of fluoridated water. In the United States, approximately 145 million people in more than 10,000 communities benefit from drinking fluoridated water. F...