I feel like my mouth looks aged. My teeth appear to have moved back for some reason, which has made my smile less attractive and has also changed the way my middle face looks. My right side (the side showing in all photos) appears to have narrowed. I don't know why this has happened, but I want to go back to looking like "me" again. What can be done to fix this? Invisalign, veneers? If not a tooth problem than what has changed (other than aging, obviously) to make my face look significantly different ?