Twenty years ago, I moved from Michigan (a state that uses fluoride) to Mississippi (a state that doesn't use fluoride). My dentist at the time told me that I was going to end up with tooth decay if I stayed down there for more than a few years. Sure enough, five years later I moved back to Michigan and ended up with a cavity in an unusual place. My (new) dentist in Michigan was completely unsurprised. He said there…
And since oral hygiene seems to be linked to eg. Alzheimers ( https://www.medicalnewstoday.com/articles/264164 ) and flouride seems to be indispensable oral hygiene thing the issue is not so straightforward...
Fluoride is not an antibiotic, so there is no plausible mechanism for it’s known topical benefits to prevent bacterial growth that might lead to Alzheimer’s (itself a theory, but an interesting one)