Typically those who understand the science, chemistry and the undeniable and overwhelming amount of data know exactly how safe and beneficial it is. Those who don't understand are typically against it, its a trend scientists are always fighting against as scientists are not always the greatest communicators and a disbeliever only needs to google their concerns to have their biases confirmed by thousands of non-scientific websites ie confirmation bias. The evidence is hard and clear that the minuscule levels of fluoride added to drinking water is completely safe and provides massive benefit.
