Recent data show private wells in more than several communities in Dedham, Maine, contain dangerously high levels of fluoride, the Scientific American reports.
U.S. tap water usually contains small amounts of fluoride to help combat tooth decay. According to the Centers of Disease Control, the fluoridation of drinking water remains one of the greatest public health achievements of the 20th century.
But the levels of fluoride in some Dedham’s wells are more than double the acceptable limit. At high levels, fluoride can cause brittle bones, and some studies have shown a link between lower IQ and fluoride concentration.
These numbers may also be elevated if you take into account fluoride exposure from toothpaste and mouthwash. The Scientific American reports the high levels may be attributed to the geology of the area, particularly naturally-occurring fluoride from areas where the wells are pulling water from.