This next tip may be as easy as drinking a glass of water: Use fluoride to reduce cavities. Fluoride is often found in municipal drinking water. If you dont drink fluoridated water because you have a well or use bottled water, you may want to speak to your dentist about supplements. Fluoride is also a component of many toothpastes and mouth rinses. Fluoride becomes part of a tooths surface, protecting the enamel from the decaying acid released by plaque. In the presence of fluoride, decay may even be quashed, essentially healing the tooth.Although over the years there has been some controversy surrounding the safety of fluoride, its use is supported by the American Dental Association, the National Research Council, the U. S. Department of Health and Human Services and the World Health Organization.