Thank you for your thorough and balanced assessment of the benefits and risks of fluoride in our water.
It's interesting to consider how much of an outcry there would have been initially if the promoters of fluoride had stressed that this is a naturally occurring substance, not a synthetic, laboratory generated contaminant. We're simply regulating the dosage.
Dosage is important. Water is considered one of the least toxic substances, but even too much water will kill you. https://pmc.ncbi.nlm.nih.gov/articles/PMC1770067/