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Ancient Romans Brushed Their Teeth with Urine The Romans used human urine as part of a mouthwash or toothpaste. This is because urine contains ammonia, which is a natural cleaning agent. For this purpose, it was often used by the Romans to make laundry cleaning agents, toothpaste and teeth whiteners!  While today we flush our urine away without giving it a second thought, in ancient times it was considered a valuable commodity. Urine contains a wide array of important minerals and chemicals such as phosphorus and potassium. The Romans believed that urine – both human and animal - would make their teeth whiter and keep them from decaying, so they used it as a mouthwash and mixed it with pumice to make toothpaste. In fact, urine was so effective that it was used in toothpastes and mouthwashes up until the 1700s As far as the Romans were concerned, the best and therefore the most expensive urine on the market came from the country of Portugal.  It was supposedly the strongest uri...