Concerning fluoride in drinking water:
There is genuine health concern about this topic. The reason for adding it to the drinking water is to convey health benefits to the financially disadvantaged, who otherwise could not afford fluoride bearing dental care products. To that aim, the concentrations in drinking water are tailored to achieve that goal.(*)
* There are two modes of intended impact with water-borne sodium fluoride ion delivery via the municipal water system. The first is the "systemic load" mode, which aims to have fluoride atoms become permanent components of developing tooth enamel in non-erupted teeth. The second is the "contact load" mode, which aims to employ fluoride's ability to reinforce and strengthen acid-damaged enamel, and allow calcium phosphate to reintegrate with the enamel after being lost due to acidic food exposure. The amount of fluoride ion delivered in municipal water delivery systems is calculated to achieve the systemic load value, as this is the most valuable to individuals who cannot afford quality dental care from a qualified dentist, or who unable to afford a quality dental hygiene regimen with fluoride containing products.
However, the disadvantaged are a minority of the population, and the municipal water delivery system serves an entire population, not just the financially disadvantaged. The majority of people can afford, and do use, fluoride bearing dental hygiene products. The additional fluoride in these products puts the users of those products at elevated levels of fluoride consumption, which has been shown to contribute to several noteworthy health problems, all stemming from a condition known as fluorosis. There are two major types of fluorosis-- tooth and bone fluorosis.
Dental fluorosis actually WEAKENS enamel, by causing dislocation faults in the phosphate lattice structures of the enamel, when fluoride ion substitution is above the ideal value. It causes permanent disfigurement of the enamel, with white pearlescent striations, as well as brown mottling, depending on how severe the fluorosis is. Tooth enamel weakened during development like this cannot be repaired by a dentist. At most, it can be concealed with a dental veneer.
The more alarming form however, is bone fluorisis. This presents itself as anomalous bone tissue formation characterized as brittle sponge-like growth pattern, and a substantially higher incidence rate of fractures, bone degeneration with age, and bone cancers in adulthood.
https://en.wikipedia.org/wiki/Skeletal_fluorosishttps://en.wikipedia.org/wiki/Dental_fluorosishttps://www.scientificamerican.com/article/second-thoughts-on-fluoride/In my opinion, fluoridated drinking water is by itself, not a significant cause for alarm. However, care should be taken to inform the public of the potential dangers of additional fluoride in municipalities where fluoride ion is delivered by the municipal water system, and that care should be taken to minimize these additional sources of exposure. (Mouthwashes, tooth pastes, et al.)
When people are unaware of dangers associated with increased fluoride exposure, they are unlikely to exercise good judgment, (especially in a climate where "more fluoride!" is seen as a positive thing), and so public education, and assurance of low fluoride dental hygiene product availability, appear to be what is prescribed to deal with this unfortunate oversight of attempting to improve the baseline health of the impoverished.
Or, you could just go full Col Ripper, and say it is a communist plot to make everyone gay, or something.