The bit about people being able to purchase flouride rinse is troubling territory because not everyone, and not every family has the funds to commit to a longterm, purchased régimen of flouride rinse. That gets into the issue of the benefits of flouride only being attainable by those with means. And the absence of flouride is associated with an elevated need for dental care. And who is least able to afford extra dental care? The very people who may be unable to afford flouride rinse. So it creates a class division in which the people who need flouride the most due to limited resources are the people who will be subject to dental care they cannot afford due to the lack of flouridation in the water. So, I think there's this socioeconomic angle that shouldn't be waved away when considering the issue in its totality.