In B. Having sparkling teeth by way of a whitening strip, or a custom bleaching tray, might seem like a 21st-century phenomenon. In reality, the art of teeth-whitening is a technique that has been around in some form for centuries. The history of teeth-whitening, or cleaning teeth, can be traced back to ancient times.
Curious Historical Uses Of Urine Include Teeth Whitening, Cleaning Clothes, And Making Gunpowder
9 Surprising But Actually Pretty Cool Uses For Your Pee
Our teeth can certainly take a beating. Coffee, tea, tobacco use, even red wine can leave unsightly stains on our teeth, ruining that perfect smile we all long to have. Many of us will do just about anything to whiten our smile because a bright, white smile can do wonders for our confidence. Interestingly, there's a historical reason why perfectly white teeth are so desired in many cultures.
9 Surprising But Pretty Cool Uses For Your Pee
But you may not know that the ancient Romans were also economical about their use of waste products—specifically, their own waste. Human urine and feces were used in daily life in at least six different and sometimes dubious ways. When left out too long, urine decomposes into ammonia, which is a great cleaning product that takes out stains easily.
Before the discovery of urethra-free urea, humankind got inventive with wee. You may have heard that the sting of a jellyfish can be treated with human urine, but in truth, all this is likely to achieve is establishing an awkward relationship between you and your dive instructor. In fact, a well-hydrated urine sample can actually trigger the stinging nematocysts deployed by the jelly to release more venom, causing you more pain. Combine that with water and you've got a basic fluid with a high pH. Here, one lucky fullo would stand in a pit of dirty clothes soaked with diluted urine and stamp away the stains.