It is not that expensive to run double-blind fluoride experiments. There are hundreds that have been run over decades. There is a Scotland that the found an 81.4% reduction in cavities. A double-blind study from New Zealand found no benefit to osteoporosis is postmenopausal women. Etc. Etc.
If these neurocognitive effects were actually measurable, they wouldn't need to cherry-picking population-level correlation studies to find effects that are within the margin of error of the tests.
If these neurocognitive effects were actually measurable, they wouldn't need to cherry-picking population-level correlation studies to find effects that are within the margin of error of the tests.