Flouride in water and formula?

Many things contain chemicals which contain fluorine. The compound which is often put into our water supply and toothpaste is sodium fluoride, though in the US, hexafluorosilicic acid and the salt sodium hexafluorosilicate are more often used. Sodium fluoride is an effective poison for rats and cockroaches and it was first used as a water additive in Germany during World War II. The Nazis were not interested in improving the health of people's teeth but were interested in making certain sectors of the population more docile. There are compounds of fluorine which are necessary - and safe - for ingestion. You should check the contents of the formula to see if it contains calcium-fluoro-phosphate. That is a natural product and is quite different from sodium fluoride.