Are there any options for treating my severely gummy smile? (photo)

There are two procedures necessary to decrease the amount of gum tissue that shows when you smile.  1.  Slight laser gum recontouring to give your teeth the perfect height/width ratio.  This is an easy procedure with little to no postoperative discomfort.  2.  A lip lowering procedure to reduce how high your lip rises when you smile.  This must be done by a plastic surgeon and can dramatically improve the appearance of your smile.  

a conservative approach is to try botox.  by paralyzing the upper lip's levator muscles you will drop down the upper lip on smiling dramatically, it you see the results you're happy with on botox, then you can have a minor surgery by a trained dentist or surgeon to cut those muscle fibers permanently.  this is a very conservative approach if you elect not to correct the overbite and have major surgical procedures.

Your condition  is called maxillary excess. The upper jaw grows down and takes the mandible (lower jaw) with it. It can easily be corrected by surgically positioning the upper jaw. You may or may not need the lower jaw surgery as well. Have to start by seeing a board certified orthodontist or orthognathic surgeon.