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>Is fluoride in drinking water toxic? I thought they added it on purpose to help our teeth or something

No, not toxic; you are correct.

the real debate is on whether the toxicity of fluoride outweighs the benefits of using it to prevent tooth decay.

we know that it can cause issues. there are also issues that have not been measured.

a lot of folks forget that unless the outcome of X is death or cancer etc ... it is often not studied. your quality of life can be greatly reduced by something but if it doesn't kill you then no one is looking at it.

Tooth decay can cause a whole litany of issues so it really is a weighing of pros and cons versus the long term effects of fluoride consumption.

Or just brush and floss properly?

I won't argue about that being the best solution, but as someone that did not start to take dental health seriously until their 30's I don't think I'm in any position criticize others for their failure to do so.

It is toxic, it's rat poisoning. Do the lower levels of tooth decay outweigh the risks? So far they have decided yes in many places but that is changing (like lead pipes)

Dose is a part of poison. Water is toxic in high does, as is oxygen.

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