But, despite the success, fluoride has always had detractors—from conspiracy theorists in the past suggesting the naturally occurring mineral is a form of communist mind control, to more recent times, in which low-quality, controversial studies have suggested that high doses may lower IQ in children.

To steel man the anti-fluoride argument you really should acknowledge the concerns about fluoride interfering with thyroid hormone synthesis, which can affect every system in the body.

https://www.sciencedirect.com/science/article/pii/S001393512...