Invisalign is effective at straightening teeth and this is evident when you look at Invisalign before and after pictures. Many people have transformed more than their smiles with Invisalign. These plastic aligners also offer the benefit of comfort. Since smooth plastic is used to make the trays, Invisalign is more comfortable than conventional metal braces. It does not have extruding/sharp edges and the trays are custom made to fit the mouth and teeth of the user.