Poor chin and mandible growth due to mouth-breathing - should I get all of these procedures or skip one? (photos)

If you have the opportunity to go through orthodontics then I would first consider orthognathic surgery (BSSO and genioplasty) since you undoubtably have some form of malocclusion and this surgery would provide both functional and aesthetic benefits. If not, then initially have a sliding genioplasty done followed by a custom wrap around jaw implant six months later.

I would start with a consultation and take xrays. Usually mandibular advancement and chin surgery is all you need to take care of this issue.

 If the teeth are significantly out of alignment,a  sliding genioplasty may be the better option. For purely cosmetic purposes, a chin implant can be added on the front part of the mandible to give added projection and a small amount of width  and vertical height. For many examples, please see the link  and the video below