Although it is rare, it is possible to lose some sensation in the upper central (incisor) dentition and lining of the upper vestibule of the upper lip after rhinoplasty. This is because, during rhinoplasty, the nasal septum may need to be aggressively disrupted along its base with the maxilla (say, for correction of a large septal spur). The nasopalatine nerve, an extension of the greater palatine and nasopalatine nerves, pierces through the anterior roof of the mouth into the nose through a hole called the incisor foramen. If this nerve is damaged, it can result in temporary loss of sensation. Typically, however, such numbness is not permanent and, presuming that the bulk of the nerve is still intact, return of sensation can take place after up to 1-2 years.