Cost of fluoridating city water
A 2009 study that tracked fluoride exposure in more than 600 children in Iowa found no significant link between fluoride exposure and tooth decay.Another 2007 review in the British Medical Journal stated that "there have been no randomized trials of water fluoridation," which is currently standard for all drugs.Fluoride is added to public water supplies at an average concentration of about 1 part per million (1 ppm) or 1 milligram per liter, or slightly below.Naturally occurring fluoride concentrations in surface waters depend on location but are generally low and usually do not exceed 0.3 ppm. Department of Health and Human Services issued a recommendation for the optimal fluoride level that should be in drinking water to prevent tooth decay.
Due to the increased use and accessibility of other fluoride sources (toothpaste, mouth rinse, etc.) and other improvements in oral health care, these new recommendations have been made," said Alice Lee, a pediatric dentist at Montefiore Medical Center in the Bronx, New York.
The paper looked at the results of 27 different studies, 26 of which found a link between high-fluoride drinking water and lower IQ.
The average IQ difference between high and low fluoride areas was 7 points, the study found.
Fluoride is an ionic compound derived from fluorine, which is the single most reactive element; it is naturally found in many rocks.
About 95 percent of the fluoride added to public water supplies is produced from phosphorite rock, according to the CDC.
It depends who you ask; fluoride is unquestionably toxic at certain concentrations.