buzzfeed The Romans used to clean and whiten their teeth with urine. Apparently it works.
Is this true?
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According to wikipedia and the sources cited there, yes they did. And yes it worked. Urine contains urea, which decomposes into ammonia, which is a modern day cleaner, and is even used in lots of toothpaste.
Here's a video about it. Romans used urine to clean and whiten their teeth, they collected urine, and used it for many other purposes. They even enacted taxes on it.