Here's a site that gives you those references. Do the critical thinking and reasoning. If you actually do the reading, you'll find what I have said is quite correct (and your downvotes are you exercising your opinion to silence others irrationally, which is coercive and evil when its arbitrary and unbacked by rational evidence).

https://fluoridealert.org/content/50-reasons/ (the list is at the bottom)

Then there is also a good paper here for the history of Flouride.

For those that don't pick out the critical parts, conclusion isn't appropriate because it neglects common factors like funding (rather the lackthereof for anti-flouride research), the lack of ability to publish (subverted journals refusing publication), and a great many papers after the 1950s; and only briefly touches on methodological issues such as the fact that early studies used young men (not infants, kids, older populations, or women), and extrapolated out for the general population.

Women's health, birth, and allergies/thyroid changes were largely ignored, and rather than correct the bad science in a rational way; the expert voices involved were minimized and discredited, while simultaneously being barred from publishing in research pools (for a perceived stance rather than for actual science, ideologically against science). Its not hard to see why the thought that Communism was playing a role in this line of inquiry.

When seeing these tactics, they were commonly known by the public at the time, and were used primarily by Communists and Marxists who weren't follow western thought based in rationalism (science) to try to subvert the population, and if this were the case, its hard to argue that they didn't succeed in subverting the bureaucracy to force the changes despite the health consequences.

Read for yourself, also that objective 15% benefit (not 2/3) extrapolated didn't properly account for increasing tooth hygiene during that same time.

Even the CDC today recognizes the benefits are mainly from topical uses. Most western countries don't allow flouridated water supplies.

Much of the research over the years had to be independently funded, or were government funded by those countries, and the science has been overwhelming, but this isn't how public trust science is supposed to work (in the US). More specifically biasing funding on safety issues to push unsafe options for profit/benefit would fall under political corruption, and a violation of the public trust.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4504307/