Some water has natural minerals in it already. It depends where you are living in the world.
Fluoride is added in small amounts normally as it helps your teeth. It mixes with your enamel making calcium fluoride. This gives your teeth a light coating helping to protect them.
Toothpastes use fluoride in their ingredients as well.
I am yet to know anything about this,it's chlorine I Know that is majorly used to treat water. Am not suprised about the flouride too because it shares some common properties with chlorine,I think I will research more on that.
Fluoride responds with the Calcium Chloride in tooth enamel to make Calcium Fluoride. At the point when added to drinking water, your teeth consistently get a little covering of fluoride, making your enamel get changed over, at any rate on the peripheral part, making a thin facade of Calcium Fluoride.
For what reason is this helpful? Incidentally, Calcium Fluoride is substantially more impervious to corrosive disintegration than Calcium Chloride, so your teeth are shielded from tooth rot. This is a similar reason fluoride is added to toothpaste and mouthwash. An examination was directed in territories that had normally fluoridated water, and in contrast with different regions where water did not have fluoride, the occurrence of depressions was extraordinarily lower in the fluoride water regions, such a large number of state governments began including a little measure of the mineral that made the regular fluoridation their water supplies, as it was shoddy. The rate of holes went down, of course.
I think that it might be important to add that fluoride isn't a strange and dangerous chemical or anything, it's just a mineral that's found naturally. It's actually very abundant, wikipedia said the 13th most abundant mineral in the crust. So it would usually already be in natural water sources (lakes, rivers, etc).