The maxilla is the facial area of the skull for the upper jaw extending across the middle third of the face up to the lower eyelid. Mid-face fractures involve the maxilla and are categorized by the Le Fort classification system. In a level 1 Le Fort fracture of the skull, the injury occurs between the nose and upper lip. A Le Fort II fracture occurs in a triangular area bounded by the teeth at the base extending to the bridge of the nose and eye sockets. A Le Fort III fracture is the most serious, affecting an area from the bridge of the nose and above, and extending horizontally across the eye sockets and beyond, to the sides of the head. In Le Fort III fractures, all of the facial bones are essentially destabilized.