Portland's fluoride debate: Is adding fluoride to drinking water dangerous?<p>On Wednesday, the city of Portland, Ore., overwhelmingly voted down a proposal to add fluoride to the city’s drinking water. The main reason given by anti-fluoride voters? Concern over adding a potentially dangerous chemical to the city’s natural water. But what does the science say? </p><img src="http://feeds.feedburner.com/~r/foxnews/health/~4/8sQt3UpMjqc" height="1" width="1"/>
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