What do you do to whiten your teeth? Use whitening strips, UV lights, maybe charcoal? But have you ever though of urine as teeth cleaner? Most would scream no. But Romans said a big yes to it. Romans also saw many benefits like using it for brightening colours, making gunpowder, and even softening leather. Used as a mouthwash by Romans, urine would be swished thoroughly, producing a pearly white finish with a slight side of pee breath. If you’re looking for a holistic teeth-whitening regimen, but aren’t as enticed by the idea of a pee-flavoured mouth, strawberries could be a good alternative.