When I talk, all my lower teeth show completely, which is an 'old' look even though I'm only in my mid-twenties. When I smile, my lower teeth show completely again but only about half or 60% of my upper teeth show. I think the problem may be that my 4 maxillary incisors are too far up. If these 4 teeth are extruded, and all my lower teeth are intruded so they don't show when I talk, will this help me get an ideal smile arc? And is it even possible to intrude all lower teeth?