Can surgical extraction of scar tissue fix my smile?

Given from your history of the problem being one of excess scar tissue below the skin surface, it would be reasonable to treat this problem just as one would treat excess scar tissue that is raised and problematic located above the skin surface--i.e. much like treating hypertrophic scars and keloids via the use of intralesional anti-inflammatory injections to shrink them. Surgery, on the other hand, does pose the potential risk for subsequent additional scar formation. You would be wise to consult with an experienced, board certified cosmetic dermatologist. Hope this helps and best of luck.