Many approaches. This requires a complex analysis of your dental structures, occlusion, soft tissues (skin, fat, muscle) as well as your bone. Once anatomic assessments are completed, a survey of your aesthetic goals must be reviewed with a discussion or realistic goals and expectations with a review of risks, alternatives, benefits, and costs. Surgery can be as simple as injectable fillers or involve complex surg.
Chin. It depends on if it is performed in the office setting or hospital. Total cost would be around 6k if done in hospital. It also depends where in country this procedure is done.