Another problem is that naturally occurring fluoride tends to be in remote mountain areas where everyone is going to be dumber from poverty and cultural isolation.
There are many counties in the US that do not have fluoride and they're right next to counties that do, so you could easily study those locations. But that won't get the answer you want.
Another problem is that naturally occurring fluoride tends to be in remote mountain areas where everyone is going to be dumber from poverty and cultural isolation.
There are many counties in the US that do not have fluoride and they're right next to counties that do, so you could easily study those locations. But that won't get the answer you want.
Which is kinda the opposite of the problem we have over in the States.