Fluoride
In what food source is the nutrient found?
Fluoridated water is the primary source of fluoride. The fluoride
content of food depends upon the fluoride content of the soil in which the food
was grown. Some infant
formulas that are made or mixed with fluoridated water also contain
fluoride. Brewed tea can contain significant amounts of fluoride. The amount
depends on the amount of tea used, the water fluoridation concentration, and
the brewing time. Fish with edible bones, such as canned salmon, also provides
some dietary fluoride. Fluoride mouth rinses and toothpastes are sources of
fluoride to the outside of the teeth (topical fluoride).
How does the nutrient affect the body?
Although fluoride helps harden the tooth enamel during the time
teeth are developing, the main action of fluoride occurs after the teeth have
erupted. Water fluoridation has been found to be effective in preventing
dental decay in both
children and adults. Topical fluoride is important in preventing tooth decay
in already erupted teeth. It does this by helping to prevent the destruction
of the tooth enamel by acid in the mouth. It also interferes with the
formation of dental plaque. Fluoride that is eaten is
secreted in the saliva and can protect teeth in the same way as topical
fluoride. Fluoride supplementation can promote bone building, but early studies
in people with
osteoporosis have found that the structure of the new bone was
abnormal. It was weaker than normal bone and possibly more prone to fracture.
Gastrointestinal side effects were also a problem. Researchers are working to
find a formulation and dosage regimen that will result in building normal
bone.
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