Can the Corners of the Mouth Be Cut to Widen a Smile? What is the Approx. Cost of Such Procedure? (photo)

My smile is terrible. It's not wide enough for my big, but close together teeth! Also, the corners point downward. Is there a surgery that can widen it a little bit, and make me look happier?? When I smile, people don't think I'm smiling all the way. And when I am not smiling, people think there's something wrong, or that I'm mad.