Teeth come in a variety of colors and shades naturally. Not to mention, they change color over the years from wear and tear and lifestyle factors. You can turn back the clock with professional teeth whitening, but did you know a bright smile isn’t a new trend? Believe it or not, teeth whitening dates back to 3000 B.C. Thankfully, you don’t have to chew on sticks or brush with urine to keep your teeth white. Here’s how teeth whitening has evolved throughout time to deliver the stunning results you see today.