Some Anglosphere countries (USA, Canada, Ireland, Australia) love to add fluoride in water. They say it’s good for people’s dental health.
Europeans (Germany, Finland, Italy, France, Netherlands, Switzeland) think it’s wrong/unethical.
There is actually regular controversy around this
https://hsph.harvard.edu/news/fluoridated-drinking-water/
Do they put fluoride in your drinking water ? Are you happy with that?
We’ve had it in the UK since before 1964.
I’m curious as to what negative impact your dad thinks its had considering he’s been drinking it his entire life…
Honestly I’m not sure. Probably the same as the chem trails and 5g, he’s all in on the conspiracies these days.