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J. William Hirzy, a chemistry professor at American University, testified that fluoride can cause health problems because it is so common in toothpaste, in certain food and drinks and from other sources besides water.

A City Council Transportation and Infrastructure Subcommittee decided Tuesday to continue water fluoridation in the nation's sixth largest city, rejecting opponents who claim it discolors teeth, interferes with thyroid function and harms brain development and IQ. Read more»

The fluoride feed line in Phoenix’s water system. The city has been fluoridating its public water supply for 22 years.

When she was diagnosed with hypothyroidism in 2004, Phoenix resident Jody Clute had no idea it would lead her, and her city, to revisit one of the biggest public health debates of the 20th century – water fluoridation. Read more» 6