this post was submitted on 22 Nov 2024
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It doesn't. This is high-school chemistry.
Fluoride only "accumulates" up to the peak concentration of the environment (no further) on places where it is removed from contact with that environment.
You can only accumulate fluoride in the soil if you keep adding it and there is almost no rain to wash it away.
Like how crops are irrigated with town water, and in many areas with lowering rainfall? Accumulates in fruit, vegetables, leaves too
Yes, irrigation with the minimum possible amount of water is known to destroy land for millennia at this point. But sodium will be a problem way before you notice any change in fluoride.