There are substances that we take so much for granted that we have stopped questioning them. Fluoride is one of them. It is found in the toothpaste we squeeze onto our toothbrushes every morning, in the drinking water of some countries, in processed foods, in pesticides on conventionally grown vegetables, in teas and in certain medicines. From childhood to old age, modern society consumes fluoride daily and in multiple forms - often without knowing it, almost always without wanting to.