Fluoride
Many people may disapprove of having fluoride in their drinking water for these reasons. In high concentrations, fluoride compounds are toxic and can cause death. In mice, the LD50 is estimated to be 184 milligrams of stannous fluoride per kilogram of body mass. An individual report involving fatality following the accidental administration of fluoride ion to a child at 5 mg/kg was cited by G. M. Whitford in 1987. While experimenting on himself in 1899, Herbert H Baldwin reported that symptoms of acute toxicity occurred at amounts as low as 0.1-0.3 mg/kg.
When ingested directly, fluoride compounds are absorbed by the intestines very quickly. Over time, the compound is excreted through the urine, and the half life for concentration of fluorine compounds is on an order of hours. It is thought that fluoride is taken out of circulation by the body and trace amounts become bound in bone. Urine tests are a good indication of high exposure to fluoride compounds in the recent past.
Skin or eye contact with many fluoride compounds in high concentrations is dangerous. In case of accidental swallowing, milk, calcium carbonate, or milk of magnesia is given to slow absorption.
I am against it, because, as I said above, fluoride can cause death if too much is applied, there is always a chance the tap water you drink can have more fluoride than the last time you drank it. The payout of good less decaying teeth is not good enough to risk you life for, assuming that accidents can take place, something happens, and you have a lot of fluoride in you water.
Fluoride increases the resistance of tooth decay. Originally, sodium fluoride was used to fluoridate water; however, hexafluorosilicic acid (H2SiF6) and its salt sodium hexafluorosilicate (Na2SiF6) are more commonly used, especially in the United States.
The fact that if a mistake is made and more fluoride was added to all the drinking water, this means everyone using that water has a chance of dieing, and for what? for the resistance to tooth decay. What will it be then, the chance of dieing but no tooth decay, or clean water and no resistance to tooth decay that is not natural.
Sources:
http://en.wikipedia.org/wiki/Fluoride
http://www.kidshealth.org/parent/general/teeth/fluoride.html
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