The Argument Clinic

Of course concentration is relevant because it determines the amount of the toxic substance being ingested. What is also relevant to the amount ingested is how much is being ingested over a long period of time, much longer than clinical trials ever study. Fluoride is in toothpaste and mouthwash that I and most people use every day. There is no need to put it in drinking water at any concentration.

And you didn’t answer my question. But that’s understandable, since you know that Chlorine and Fluorine are both halogens and have similar reactivity, which is, you know, high.