It's hard to look like the same person when your teeth are coming in and falling out at different times.

So in order to continue swapping out Mary-Kate and Ashley during the later seasons of "Full House," both had to wear fake teeth.

Have mercy.

Read more: http://www.foxnews.com/slideshow/entertainment/2011/07/12/celebrity-secrets/#ixzz1VRLcIjwH

http://t2.gstatic.com/images?q=tbn:ANd9GcSHYdje4ceTxxx1N9UX8T10aWmIZEtUvy9yVhnJy2JTqXN7eMR3nQ

Your in big trouble mithter! For spilling their secret!!:lol: