Abstract
A case of a tooth erupting into the maxillary sinus is reported. A 14-year-old girl complained of right nasal obstruction and purulent discharge. X-ray examination revealed a tooth-like structure in the right maxillary sinus. The Caldwell-Luc operation was done and the tooth was removed. The tooth was situated in the superior wall of the maxillary sinus. No cyst formation was observed. Because of the increased danger in younger persons of orbital penetration, an erupted tooth situated in the superior wall of the maxillary sinus should be removed surgically whether or not there is infection in the maxillary sinus.