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HANCOCK COUNTY, Maine (NEWS CENTER) -- Testing performed on private wells in 25 percent of Maine towns found areas with dangerously high fluoride levels, particularly in Hancock County, reported Scientific American magazine Wednesday.

NEWS CENTER's media partners at the Portland Press Herald report that results showed that Dedham had the highest percentage of wells that tested above state guidelines, at 37.8 percent. Eight of the 10 towns with dangerously high levels were clustered in Hancock County. The Maine Geological Survey said that there is a lot of granite in the area which contains fluoride.

Fluoride is sometimes added into city water, though at very low levels. Low levels help with oral hygiene while high fluoride levels can cause pitted teeth and brittle bones.

Read more at the Portland Press Herald's website.

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