Fluoride is a mineral that helps prevent tooth decay and helps keep your bones strong.

The amount of fluoride you need each day depends on your age and sex. Here are the average daily recommended amounts in milligrams (mg).

Foods and water do not contain much fluoride naturally. Fluoride is sometimes added to public water supplies––called “fluoridated” water––and some bottled waters.

Most of the fluoride you get each day comes from drinking fluoridated water. You can also get fluoride from consuming foods and beverages made with fluoridated water, like tea and coffee.

Most toothpaste and some mouthwashes also contain fluoride. Even though you should not swallow these, they still add slightly to the amount of fluoride you get each day.

A few dietary supplements, including some multivitamin/multimineral products, contain fluoride. Liquid fluoride drops for children are also available. Fluoride in dietary supplements is usually in the form of sodium fluoride.

Most people in the United States get enough fluoride from what they eat and drink, as well as from any dental products they use.

Scientists are studying fluoride to understand how it affects health. Here are a few examples of what they have learned:

Tooth decay
Fluoride helps protect your teeth by strengthening the outer enamel surface. If you get too little fluoride, your teeth might weaken and develop cavities. Cavities can lead to pain, tooth loss, infections, and other health problems.

Surveys show that children and teenagers who drink fluoridated water have fewer cavities. Also, adults who drink fluoridated water have fewer decayed and filled teeth and lose fewer teeth.

Children who take dietary supplements that contain fluoride have a lower risk of tooth decay and tooth loss. Many dentists recommend fluoride supplements for children living in areas where the water supply is not fluoridated or contains too little natural fluoride. We don’t know how fluoride supplements affect adults.

Studies suggest that giving a pregnant woman fluoride dietary supplements does not help prevent cavities in her child’s teeth.

Bone fractures
Fluoride helps bones grow and stay strong. Some studies show that taking fluoride dietary supplements or drinking fluoridated water might lower the risk of broken bones. Other studies show no effect on bone strength or fracture risk.

More research is needed to better understand if fluoride dietary supplements and fluoridated water help improve bone health and prevent fractures.

Infants and children who get too much fluoride while their teeth are forming can develop a condition called dental fluorosis. This can cause white lines or dots, stains, or small dents on the teeth.

Swallowing extremely large amounts of fluoride from dental products or dietary supplements can cause nausea, vomiting, abdominal pain, diarrhea, bone pain, and even death in rare cases.

Getting too much fluoride over a long period of time can lead to a condition called skeletal fluorosis. This very rare condition causes joint pain and stiffness, weak bones, muscle loss, and nerve problems.

The daily upper limits for fluoride are listed below.

Fluoride is not known to interact or interfere with any medicines or dietary supplements.

Tell your doctor, pharmacist, and other healthcare providers about any dietary supplements and prescription or over-the-counter medicines you take. They can tell you if these dietary supplements might interact with your medicines. They can also explain whether the medicines you take might interfere with how your body absorbs or uses fluoride or other nutrients.