The surgery might involve one jaw or both jaws concurrently. The modification is done by making cuts in the bones of the mandible and/or maxilla, and repositioning the cut pieces in the desired alignment. This surgery is usually performed with the use of general anaesthetic and a nasal tube for intubation. The nasal tube enables the teeth to be wired together during surgery. The surgery usually does not involve cutting the skin. Instead, the surgeon is often able to go through the interior of the mouth.