[redfern314]

In no way does it set a dangerous precedent. Fortifying flour and iodizing salt (both of which could be termed a "medical treatment") were huge successes, with universally positive results and at virtually no cost. Mandating something like this should be done cautiously (in either direction), but fluoride isn't the first, only, or last example of it.

The only difference is that it's rather harder to avoid fluorinated water than iodized salt if one is so inclined, which raises the bar for proof of efficacy and preponderance evidence that it does not cause harm (which has been provided by others in this thread).