Function:
Fluoride is closely associated with calcium in the body. It changes the acid level in dental plaque by influencing several enzymes in the mouth thus reducing the action of bacteria. It also has an ability to stimulate new bone formation and may be important in preventing osteoporosis.

Recommended Dietary Allowance:
The AI for males is 4 mg and for females 3 mg per day.

Deficiency:
Low levels results in a significant increased risk of dental caries (cavities).

Sources:
Most foods have fluoride in low concentrations. Brewed tea is a rich source and decaffeinated teas have almost twice as much.

Fluoride is added to the water supply in many areas. Beverages made in those areas have a correspondingly increased level.

Many dental products have added fluoride and dentists use it frequently as part of their examinations or treatment.

Toxicity and UL:
High fluoride levels in childhood during formation of the teeth can result in a defect in the enamel (fluorosis) which is cosmetically unacceptable. There seems to be no detrimental effects on the function of the teeth even in advanced forms. Prolonged high exposures resulting in fluorosis in the skeleton are rare (only 5 cases confirmed in the U.S. in the past 35 years) but may cause joint pain, calcium deposits in tissues, and muscle wasting.

The UL is 10 mgs per day.

Recommendation:
No supplementation is needed.

For more information visit:
http://osu.orst.edu/dept/lpi/infocenter/minerals/fluoride/