Rob Gronkowski's NFL future is up in the air. He's young, but he doesn't need any money. Apparently the all pro tight end hasn't used any money earned playing football and only lives off of endorsements. When you are as marketable as Gronk, it is easy to see how that is possible. Gronk doesn't discriminate when it comes to his endorsements either. His latest one has him doing some ridiculous dancing for.... teeth whitening. Check out the commercial below: