In China, studies indicate lower IQs in children with high fluoride exposure. Fluoride interferes with hydrogen-bonding, which is critically important in biological systems. Fluoride may cause genetic damage. Fluoride is excreted through the kidney and those over the age of 50 have decreased excretion rates. People with diabetes mellitus are at an increased risk.
Fluoride depresses thyroid function.
Fluoride may damage our immune system. Poor nutrition, or malnutrition, can accelerate fluoride's toxic effects. Cooking food in fluoridated water results in increased dietary fluoride levels. People are exposed to fluoride, even in non-fluoridated areas, from many other sources, such as soft drinks, fruit juice, beer, processed foods, toothpaste, etc. Recently declassified U.S. government documents show that fluoridation started out as a cynical ploy to protect a highly toxic chemical vital to powerful Cold War military and industrial vested interests.