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Fluoride is great in toothpaste. Kills the germs and sterilises the gums.
I fought our Council to stop fluoride being added to our water here in Southampton in the UK about 10 years ago. I asked questions about whether gastrointestinal doctors had been consulted and what the effects were on the rest of the body, the bones etc. Nobody could answer. At the time I found that worrying. I am pro-vaccination, pro-science. I pointed out the severe lack of dentists that even kids dont any longer have access to at the time (it has since become far worse). Without actual dentists people lose the influence they provide as well as the treatment.
Chlorine chemistry is added to water to treat the water. Fluorine is added to treat the person. And to me that sounded like medication with no opt out (other than moving home). People should have a right to chose what they dont want to put in their bodies, even if it is technically slightly harmful in the long term (even nutrients). Science is learning that over sterilisation of other parts of the body (eg the skin) can affect the health. What we need is far, far more data on those that do have these water additions to see what happens to the populations health.
Fluoride does not kill or sterilize anything. It reacts with enamel (hydroxyapetate) to convert it to a stronger version (hydroxyfluorapatite).
People who want their enamel to be softer and wear through are welcome to drink bottled water.
I am already paying for water - through my water bill. I have a right to as clear a water as possible. And fluoride is technically a sterilising agent - fluorine and chlorine are right next to each other in the periodic table.