Earlier quoted context omitted.
The missing context here is that the science and established benefits of fluoride aren’t a culture war political football in those countries. These countries largely publicly recognise the benefits of fluoride, but don’t add it because: - Some countries opt for intake via supplementation. - Some have a naturally sufficient supply in drinking water via natural processes. - Some even need to reduce the abundance of flu…
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I think you are kinda misusing science/not science arguments.
This is indeed the scientific reason why there is flouride in the water. It is also scientific reason why some countries removed it.
In some countries people take care of their teeth on average and in other countries not so much. So there is science for why fluoridation happens. You can read many articles about the fluoride benefits for teeth and what is the impact of teeth for overall health.