Ancient Romans used human urine as mouthwash. The ammonia in urine is an effective natural cleaning agent. How? - Quora
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The Ancient Romans Had Many Uses for Urine, Including Teeth Whitening | Hornet, the Queer Social Network
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From Gunpowder to Teeth Whitener: The Science Behind Historic Uses of Urine | Science| Smithsonian Magazine
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Why do Romans have a soft spot for urine when washing clothes, brushing their teeth, and bleaching with urine? - iNEWS
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Ancient Romans Loved White Teeth - All Means Were Acceptable To Get Them Even Portuguese Urine - Ancient Pages
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The Ancient Romans Had Many Uses for Urine, Including Teeth Whitening | Hornet, the Queer Social Network
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