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TIL that ancient Romans used human urine as a mouthwash: Due to its ammonia content, urine was used as an ancient form of teeth whitening and stain removal.

https://decisionsindentistry.com/2023/12/a-glimpse-into-the-oral-hygiene-regimens-of-ancient-romans/
#til #todayilearned
https://www.reddit.com/r/todayilearned/comments/1gk1hji/til_that_ancient_romans_used_human_urine_as_a/

also used to whiten togas and tunics in laundries. Public urinals' output was taxed at times.