Consider this: As a child in the late 70's and through the 80's I got to experience flouride treatments every six months. Once I had my first cavity, hey then they gave me prescription flouride rinses for at home. I got even more cavities. And discolored teeth. So they continued with flouride. More cavities! It almost seems like the more flouride they give you , the more cavities you get. They said I had "weak enamel". Flouride can cause weak enamel and damaged teeth. I am proof it does not work.