this post was submitted on 21 Apr 2025
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[–] jol@discuss.tchncs.de 20 points 3 months ago (3 children)

One of those things that makes you wonder who tried it first and for long enough to notice that it whitened your teeth.

[–] GoodLuckToFriends@lemmy.today 15 points 3 months ago

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.

[–] wreckedcarzz@lemmy.world 11 points 3 months ago

"wait, you're supposed to spit at the end?" --discoverer

[–] Revan343@lemmy.ca 5 points 3 months ago

Probably noticed that pissing on a rock in the same place over and over started to bleach it