11-21-2014, 10:48 AM
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Apocalypse
Industry Role:
Join Date: May 2007
Location: Limbo
Posts: 3,043
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Like just about any substance known to man fluoride can be beneficial at low levels but harmful at high levels. Dose is always the determining factor.
WHO | Naturally occurring hazards
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Fluoride is found in vegetables, fruit, tea and other crops. although drinking water is usually the largest contributor to the daily fluoride intake. Fluoride is also found in the atmosphere, originating from the dusts of fluoride-containing soils, from gaseous industrial wastes, from the burning of coal fires in populated areas and from gases of volcanic activity. Thus fluoride, in varying concentrations, is freely available in nature. Most of the studies of fluoride intake have been done in developed countries. In temperate climates, daily exposure is about 0.6mg/adult/day if the water is not fluoridated. The WHO guideline value for fluoride is 1.5mg/litre, with a target of between 0.8–1.2mg/l to maximise benefits and minimise harmful effects. Acceptable levels depend on climate, volumes of water intake and the likely intake of fluoride in other sources. Much depends on whether other sources, such as those mentioned above, also have high levels.
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