This is a subject that I have debated for many, many years.
When the media, politicians, people in general, talk about Fluoride they are only telling half the story. There a two forms of Fluoride. One form is Sodium Fluoride (NaF) ; and, the other form is Calcium Fluoride (CaF2). Learn the difference between the two forms, one is highly toxic, the other is somewhat benign. Then ask the water Authorities to clarify which form they are adding to the water ? and which form is found natural in water ?