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i don't drink tap water, i don't think as many people do generally in the US as they used to 20 years ago, there's a lot of reasons for that, but it would be interesting to see how much fluoride the average person takes in from drinking water to begin with nowadays
A friend of mine used to always make fun of me for not drinking tap water. I explained that it taste bad and that you can see the particles floating around in it. He said "no no no, the Gov wouldn't allow that. It's safe to drink!" I know it is safe, but the quality sucks.
This same friend stopped drinking from the tap after he moved to the neighborhood next to mine.
All that is to say that while the tap water in most areas of the US are perfectly safe for consumption, that doesn't mean that it is pleasant tasting.
If you have shit floating in your water, you need to get that checked out because it's almost certainly an issue in your end.
The best is there will be hard, medical and scientific data to absorb and see if cavities spike in these areas and compare them to past data. I might have a hypothesis of what will happen.
IIRC the biggest risk of the fluoride is it can pull calcium from the muscles in the digestive tract. With the tiny amount in drinking water, you would normally only feel an effect (like a slight cramp) if you drank too much, too quickly. Your body would be able to replace the calcium from its stores within a minute or two. If it is too uncomfortable, a simple antacid can speed it up.