Please also see:
The Surgeon General and the Centers for Disease Control and Prevention (CDC) position www.publichealthreports.org/do...
Community Preventive Services Task Force, an independent, nonfederal, unpaid panel of public health experts, which concluded that research evidence "does not demonstrate that community water fluoridation results in any unwanted health effect other than dental fluorosis" (white spots on teeth)
In 2011, the CDC proposed a new level for fluoridation — 0.7 parts per million [it was previously 0.7-1.2] — that is expected to reduce the likelihood of fluorosis while continuing to protect teeth from decay.
Scientific Reviews and Reports: Assessing the Evidence (CDC)
The American Academy of Pediatrics
"A 2010 study examined the issue of fluorosis and infant formula, and reached the conclusion that 'no general recommendations to avoid use of fluoridated water in reconstituting infant formula are warranted.' The researchers examined the condition’s impact on children and concluded that 'the effect of mild fluorosis was not adverse and could even be favorable.'"
Seems like this may be, like measles and whooping cough immunizations, one of those things where a benefit which heavily outweighs its (in this case minor) risks is no longer recognized as a major benefit once it has succeeded in radically reducing a significant health problem. A few generations in, people have forgotten what it was like before.