Treatment for Underbite? (photos)

An underbite, also known as a Class III Malocclusion, can be the result of an underdeveloped maxilla (upper jaw) or overdeveloped mandible (lower jaw). Severe cases almost always require orthodontic surgery (orthognathic surgery). However, mild cases, such as yours do very well with simple orthodontic planning. Removable orthodontics such as Invisalign Orthodontics uses clear and removable aligner trays over teeth to expand the upper arch and reduce the flaring or width of the lower arch. Your first photo indicates that you have a simple  edge-to-edge bite with some cross bite. There are often easily corrected with Invisalign therapy. 

The secret here would be to get your upper lip better supported by the upper teeth.  Invisalign could be used to bring the upper front teeth forward, leaving a gap behind the canine teeth.  That gap is pretty much out of the smile and certainly better than bulldog bite or jaw surgery.