This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Dental
Which of the following are goals of orthognathic surgery? 
Select and explain. 
A. To improve facial esthetics, B. To shorten orthodontic treatment time, C. To improve orthodontic treatment results, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: The goals of ortho esthetics are:

To improve facial esthetic and self-image of patient.
To shorten orthodontic treatment time and improve orthodontic treatment results.
To improve PDL stability and prognosis.
To correct jaw relationships prior to major restorative procedure.