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?
I always found people freaking out about it to be silly. There’s places like West Texas (Ogallala Aquifer) and East Africa where fluoride levels are naturally high but nobody shrieks about that. The data shows it’s good for the health of your teeth, and having healthy teeth and gums is highly correlated with good health in general.