Earlier quoted context omitted.
It's also restricting the freedom of communities if you ban them from adding fluoride to their water if they like to. This ban is anti-freedom. (Just like forcing them could be argued to be, even though that's what you argued against.) So, this ban is arguably reducing freedoms on multiple levels.
Personal freedom ≠ "freedom of communities"—there is no such thing. Freedom applies to individuals, not collectives. When a community makes a decision that affects all its members, that’s democracy, but democracy is not unlimited authority. A majority vote does not grant the right to infringe on individual autonomy, which is why safeguards exist against the tyranny of the majority. Banning fluoride does not restrict…
In the US, it most certainly does. We have freedom to associate, and associations also have freedoms. Were it not so, we wouldn't have even been able to arrive at the conclusion we have with regard to corporate money in politics.