Fluoride (said like floor-eyed) is a mineral that occurs naturally in soil, water, and air that has been shown to prevent cavities, or tooth decay. For the past several decades, fluoride has been added to community water supplies and oral care products such as toothpaste and mouth rinse. Fluoride works by strengthening the tooth’s hard outer surface called enamel.

You can get fluoride by drinking tap water in communities where the public water system adds fluoride and by using fluoride toothpaste and mouth rinse, as well as from certain foods and beverages. In the dental office, a dentist can apply fluoride varnish or gel, and in some public health programs, children can have fluoride varnish applied to their teeth.

Fluoride can prevent tooth decay across the lifespan; both children and adults benefit from it.

Clinical Trials

Clinical trials are research studies involving people. They seek to answer specific scientific questions to find better ways to prevent, detect, or treat diseases, or to improve care for people with diseases.​​​​​​

Data & Statistics

Since community water fluoridation began in 1945, it has been demonstrated to be a safe and cost-effective way to prevent tooth decay. It has been identified by the Centers for Disease Control and Prevention as one of 10 great public health achievements of the 20th century.

Water fluoridation protects teeth in two ways:

  • When delivered through the water supply to children during the tooth forming years.
  • Through direct contact with teeth throughout life.

Hundreds of millions of Americans now receive fluoride through their community water.