Fluorine has a protecting action against caries, but this is a local effect. If you drink it, you are running the risk of all kinds of toxic actions.
“I had a vague idea of the song's impact in the '60s, but that was tempered by the hate mail and threats I was receiving. It was only about ten years ago, when I finally put it back in my show because so many people were asking for it, that I understood 'Society's Child' real impact.”