“I believe there is no question that fluoridation is responsible for most, if not all, of those crowns.”
Sorry, but that’s absolutely absurd. Your teeth developed at a time when water wasn’t fluoridated, so if anything, lack of fluoridation is to blame.
Going on the assumption that you are a dentist which I am willing to do, although anyone can safely claim almost anything on an anonymous web forum, I won't attempt to argue with a highly trained professional on matters concerning his or her field of expertise.
However, I do want to mention that there are a considerable number of dentists both in the US and elsewhere who would dispute at least some of your claims for the benefits of fluoride in public water systems. As I mentioned earlier in this thread, a recent president of the Canadian Dental Association, or whatever the exact name of the organization is, resigned his position because he felt that he could not in good conscience continue to support the organization's commitment to fluoridation of public water systems. In his statement, which I read but did not bookmark, he cited specific data compiled by well qualified research scientists that supports the proposition that fluoridation of public water systems causes more harm than good in the long run.
If as you say my age exempts me from the undesirable side affects of fluoride on my teeth because it was not in the water I drank during my youth, then I will take your word as a dentist that what you say is true. But my dental record is not relevant to the study that came to the conclusion that fluoride in drinking water is an important causative factor in the increasing percentage of elderly patients who are afflicted with osteoporosis. I would also point out that the Canadian dentist who voiced his opposition to the fluoridation of public water systems did not mention fluoride as a cause for brittle or weakened teeth. His criticism was confined to the widespread use of fluoride as it relates to the rapidly rising rate of osteoporosis in the elderly population, which I think you would agree is a much more serious matter than brittle teeth.