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Data over a 15-year span showed a reduction of more than 60% in tooth decay among 30,000 school children in Grand Rapids, demonstrating fluoride's protective benefits.
Blue, unbanded fluorite occurs in many localities around the world. Within the UK, blue fluorspars are also found in County Durham, especially Weardale. [1]: 39 Elsewhere, blue fluorspar is known in the Ardennes region of Belgium; the Cave-in-Rock area of Illinois in the United States; [1]: 39 and at various localities in Mexico and China.
Fluorite is allochromatic, meaning that it can be tinted with elemental impurities. Fluorite comes in a wide range of colors and has consequently been dubbed "the most colorful mineral in the world". Every color of the rainbow in various shades is represented by fluorite samples, along with white, black, and clear crystals.
In most drinking waters, over 95% of total fluoride is the F − ion, with the magnesium–fluoride complex (MgF +) being the next most common. [citation needed] Because fluoride levels in water are usually controlled by the solubility of fluorite (CaF 2), high natural fluoride levels are associated with calcium-deficient, alkaline, and soft ...
One study found that men with moderate-to-high levels of exhaustion had a 2.7-fold increased risk of heart attack within five years and a 2.25 higher risk within ten years. The study also found a ...
Controversies include disputes over fluoridation's benefits and the strength of the evidence basis for these benefits, the difficulty of identifying harms, legal issues over whether water fluoride is a medicine, and the ethics of mass intervention. [20] The first large fluoridation controversy occurred in Wisconsin in 1950.
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