"Environmental health groups are now looking to the U.S. Environmental Protection Agency to impose tougher standards on fluoride in drinking water, building on a decision Friday by the federal Department of Health and Human Services to lower the recommended level for the first time in nearly 50 years.

The HHS move came in the wake of a government study showing that about 2 out of 5 adolescents have tooth streaking or spottiness because of excessive fluoride. In extreme cases, teeth can become pitted.

The dangers may go beyond cosmetic issues. The EPA released two new reviews of research on fluoride Friday. One study found that prolonged, high intake of fluoride can increase the risk of brittle bones, fractures and crippling bone abnormalities."

Margot Roosevelt reports for the Los Angeles Times' Greenspace blog January 8, 2011. [2]