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Water fluoridation programs in the United States and other countries which have them use either sodium fluoride (Na F), hydrofluorosilicic acid (HFSA) or the sodium salt of that acid (Na SF), all technical grade chemicals to adjust the fluoride level in drinking water to about 0.7–1 mg/L. HFSA and Na SF have been shown to leach lead (Pb) from water delivery plumbing, while Na F has been shown not to do so. Our focus was on comparing the social costs associated with the difference in numbers of cancer cases arising from As during use of HFSA as fluoridating agent versus substitution of USP grade Na F....

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At e Harmony, we know that dating as a busy professional can be a challenge; that’s why we take time getting to know you and finding out what you’re looking for in a partner....