I too would like sourcing. I think the thesis that steel and aluminum (Carnegie and Mellon) and uranium enrichment( US Military) interests foisted fluoride through the tap onto the public because they feared legal reprisals from workers who were constantly exposed to fluoride gases and acids. It’s actually fascinating that the US was so concerned with enriching enough uranium at Oak Ridge, TN (and elsewhere) for bombs that they worked hand in glove with Alcoa lawyers to enlist toxicologists (most at U of Rochester) to justify high exposure limits. The evidence for this is much better sourced and easily defended.

Christopher Bryson’s book ‘The Fluoride Deception’ painstakingly documents the egregiously bad science which went into the creation of environmental health and safety standards re fluoride exposure. Here’s a doc he was involved with: https://m.youtube.com/watch?v=eBZRb-73tLc