Yeah, this is one of those places where because RFK Jr took the anti- stand there's an understandable assumption that it's more nutty anti-science stuff, but it's much less clear cut when it comes to fluoridation. Europe has much lower rates than the US, which is an outlier on these stats only approached by Australia, and before Utah the major high profile anti-fluoride stance was made by Portland:
https://www.wweek.com/portland/blog-30229-portland-voters-so...
To the extent this is a polarized left-right issue, it's only recently and only because everything is polarized right now.