There are barbeque grills. Automobile grills. Bar and grills. And then there are dental grills. Popular. Trendy. Shiny. It's easy to see why you'd want to upgrade your smile with a few more carrots, er carats. The American Dental Association (ADA) actually says no studies have shown grills as harmful. But they also haven't found any studies that have proven them to be safe either. So if you're considering adding a bejeweled accessory to your mouth, get all the facts first to make sure this bling is for you.