I've worked with fluoride chemistry in the lab, which entails some specific safety protocols due to its effects on the human body if you make a mistake. Your characterization of the health risks to humans is misinformation, particularly at the exposure levels in water regardless of how much you drink.
Fluoride aggressively and preferentially binds to calcium in the human body. That's how it protects teeth, the chemicals that cause tooth decay have a weaker affinity for calcium than fluorine, and therefore can't displace it.
The mechanism of action for its lethality is the same. Calcium ions are used throughout the human body, notably in the heart for critical signaling functions. If you are exposed to sufficient quantities of fluoride, it will circulate until it finds some calcium in your body, including readily depleting your calcium ion channels which causes your heart to stop working.
Human bodies have significant excess calcium floating around. There is simply not enough fluoride in water, no matter how much you drink, to tax those calcium reserves. People have been drinking naturally fluoridated water, some at much higher concentrations than municipal water, for millennia.
We can argue about the relative safety of fluoride to the human body. Maybe there's a middle ground somewhere, but saying that it is hazardous to your health in excess amounts and that those excess amounts can be found in tap-water isn't controversial nor is it misinformation.
For example, as a very basic, low-level example, exposing children to fluoride early on when teeth are forming causes dental fluorosis. This is well-known, well-studied, and not at all controversial. And in fact, tap water is the most common source of dental fluorosis.[1]
Now there are clear benefits to fluoride: It can be used in a variety of circumstances and probably has done humanity a net good, especially in areas where dental hygiene (for whatever reason) isn't well understood or well-practiced.
But there's clearly a level where it's not safe to expose to human beings.
Fluoride aggressively and preferentially binds to calcium in the human body. That's how it protects teeth, the chemicals that cause tooth decay have a weaker affinity for calcium than fluorine, and therefore can't displace it.
The mechanism of action for its lethality is the same. Calcium ions are used throughout the human body, notably in the heart for critical signaling functions. If you are exposed to sufficient quantities of fluoride, it will circulate until it finds some calcium in your body, including readily depleting your calcium ion channels which causes your heart to stop working.
Human bodies have significant excess calcium floating around. There is simply not enough fluoride in water, no matter how much you drink, to tax those calcium reserves. People have been drinking naturally fluoridated water, some at much higher concentrations than municipal water, for millennia.