this post was submitted on 21 Apr 2025
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One of those things that makes you wonder who tried it first and for long enough to notice that it whitened your teeth.
An even older use of urine was to clean clothes. In greek cities, there were pots to piss into on the street that launderers would pick up. So it probably evolved from that to cleaning other things, like your teeth.
"wait, you're supposed to spit at the end?" --discoverer
Probably noticed that pissing on a rock in the same place over and over started to bleach it