All I can tell you is that the linked book points out his reasoning. The book I mentioned does not talk about #1 and #3, but does mention his reasoning concern

All I can tell you is that the linked book points out his reasoning. The book I mentioned does not talk about #1 and #3, but does mention his reasoning concerning #2 - that a lack of specific nutrients during pregnancy can lead to health problems, and that crowded teeth has nothing to do with genetics but instead has to do with nutrition. If you read up on livestock nutrition, you will find that a lack of certain nutrients during gestation does lead to certain well-defined problems in the offspring; and for the next litter fixing the nutrition for the mother, stops the problem from recurring. I suppose a search for "pig gestation nutrition" will get you some links. Personally I do question the need for fluoridation of water supply, given that other countries do not do it and their populations do not have significantly higher dental problems, i.e. lack of fluoridation is not correlated with higher rates of dental problems. If Price's argument about nutrition is correct, fluoridation is treating the symptom rather than the cause in any case.