“They are relatively harmless if properly applied,” says Dr Greg Grillo (ExpressDentist.com). Done properly, the process is similar to getting braces (dental bond is applied and then a bit of UV light). It is pain free and usually over within 10 minutes. However, as Dr Grillo warns, it’s best to have your gem applied by a dental specialist (and whatever you do, never, ever use super glue). “A dentist will use a non-toxic bonding agent,” he continues.