We have all seen people with "buck teeth," whose upper teeth extend too far beyond their lower teeth to align properly. But sometimes, the reverse can happen -- a "cross bite," where the lower teeth extend beyond the upper, in a kind of bulldog effect. Either way, cosmetic and functional problems can arise as a result.Michael's cross bite was only on one side of his smile. We decided to realign his teeth with Invisalign, so that his bite, and his smile, would be symmetrical. After only six months, Michael's lopsided bite was corrected, and he had a beautiful, natural-looking and symmetrical smile.