Putting fluoride in water promotes freedom. That sounds crazy, but let me justify it. If you are poor you can't go anywhere or buy anything. You're not free if you're poor. If you are sick, you may be confined to a hospital bed or not feel good enough to do anything. If you are sick you're not free. Putting fluoride in water reduces dental costs and incidence of cavities and therefore tooth infections, particularly a…
But you will brush your teeth anyway, and then you apply fluoride topically. It works. Here in Sweden we decided against fluoride for this reason and the fact that it is in fact toxic. It isn't sensible to use systemic exposure when we can use topical exposure and can improve mouth health by education, so that people do what they're supposed to. The fluoride approach achieves a basic level of health, but you can do s…
Relatively few of the poor have the disposable income, time, education, and long-term worldview needed to reliably do that.
EDIT: This comment is about America's poor. Though the same applies in much of the world.