I am having a double jaw surgery to adjust my under-bite. would this be considered a routine surgery?

Depends: That all depends on what you would consider "routine". From the surgeon's standpoint, it might be routine, but from your's-far from it. It is a not uncommon surgery, but complex in nature. The results are usually quite remarkable, and I have never had a patient who has gone through this have any regrets. As you recover, keep your focus on the end result-it will improve your future quality of life.

Common: Think of something as routine and you make mistakes. This is a big deal to the patient, but it is very common, and I have been involved in countless 2 jaw surgery cases over the years. Profile considerations dictate why an oral surgeon and orthodontist would choose this. Your underbite is due to too large of a lower jaw and a lack of midface (upper) projection. Common, but not ho-hum.