That is an excellent hypothesis. Perhaps if people swished with fluoridated water they would have less cavities. There are also numerous very good studies showing the effects of fluoridation on cities. There have been cities who voted to remove fluoridation, then saw cavities increase, and voted to put it back, resulting in the expected decrease in cavities. So clearly, it works.

I rarely use google and my results are the same

My vacuum robot uses lidar. How expensive could it be??