Is water fluoridation safe and effective? Does water fluoridation prevent dental caries? Why did the national union that represents most of the scientists who work for the EPA write a letter to Congress that condemns water fluoridation? If water fluoridation is safe and effective, why don't other countries fluoridate their drinking water? Why do most municipalities use a toxic waste product to fluoridate their water? Is there a "hidden agenda" behind the effort to fluoridate drinking water?