DNA appliance / homeoblock help with recessive lower jaw? (photos)

I would like to correct it or at least improve this without surgery if possible. Is this suitable for me? How exactly does it work? Does this just bring the jaw forward when biting down or do the jaw muscles gain strength to hold the jaw forward at a resting position? Also, if the lower jaw is brought forward would orthodontics be needed to bring the teeth backwards to correct the bite? I also have some jaw asymmetery- is this something that could be addressed?