A broken lower jaw usually causes pain and swelling, changes the way the teeth fit together, and prevents the person from fully opening the mouth. Fractures of the middle part of the face can cause swelling, double vision, facial numbness, a sunken eyeball, changes in the way the teeth fit together, and/or inability to fully open the mouth. Doctors can usually detect jaw and face fractures during an examination, but usually x-rays are taken or computed tomography (CT) is done. A lower jaw fracture is treated by resting the jaw, surgery, or wiring the jaw closed until bones heal. A midface fracture can be treated surgically, but surgery usually is done only if the fracture causes problems other than pain and swelling.