Benign cementoblastoma is a comparatively rare odontogenic tumor characterized by hypercementosis. This tumor generally occurs in the lower molar tooth region but rarely in the incisor region.<br/><br/>We experienced a case of benign cementoblastoma that developed around the root apex of the maxillary left central incisor in a 15-year-3-month-old girl. The affected incisor showed a slight discoloration and extrusion of the crown in comparison with the right central incisor. Radiographic examination combined with computed tomography revealed a well-defined, round, radiopaque mass confluent with the root apex of the tooth. After the root canal treatment of the affected incisor was performed because the dental pulp was devitalized, the tumor was removed accompanied with the root resection. Following-up 5 years after the treatment revealed no signs of recurrence.<br/><br/>We attempted a conservative treatment of the affected tooth since the patient was young and the tumor was relatively small. To do the conservative treatment appropriately, the radiographic examination with the computed tomography was important and useful for the diagnosis.