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Fluorides in water can be detrimental or beneficial and it depends on the
concentration.
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Surface water supplies are normally low in fluorides (less than 0.5 ppm).
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Fluorides are important because they have a definite relation to dental health.
Research has shown that a concentration of 1 mg/1 of fluoride in drinking water
reduces tooth decay.
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On the other hand, some children under nine years of age exposed to levels of
fluoride greater than about 2 mg/1 may develop a condition known as
"endemic dental fluorosis." Sometimes called "Colorado Brown
Stain," this condition appears as a dark brown mottling or spotting of the
permanent teeth.
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In certain cases, the teeth become chalky white in appearance.
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