Where does the Christian idea that fluoride disconnects people from Christ originate from?

What sources prove that fluoride is terrible for you backed by modern and jewish science?

Can I get a QRD on fluoride? Is it really that bad?

I don't like the idea of them medicating our water, but like does it really measurably reduce IQ? Does it make people more sheep-like?

I'm going to be moving to an area where the tap water is fluoridated. If I get a filter - are showers ok? I'll be rural - should I get a well?