• PugJesus@lemmy.worldOPM
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    2 days ago

    Explanation: Despite having a great many features which seem positively modern to our eyes, like public restrooms and clean water supply, other practices of the ancient Romans were less… intuitive to our eyes. Swishing fermented urine, for example, was used as a method of whitening teeth.

    Worst part is, it works, though not nearly as well as any modern methods. It’s the ammonia.

    • IninewCrow@lemmy.ca
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      2 days ago

      Another one that always surprised me was in using lead to sweeten wine.

      But I’m sure historians 2,000 years from now will look at all the dumb dangerous poisonous things we’re doing to ourselves today and wonder what the hell was wrong with us.

    • jol@discuss.tchncs.de
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      2 days ago

      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
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        2 days 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.

      • Revan343@lemmy.ca
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        2 days ago

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