Calvani L, et al. - Study's goal was to find out whether an increased concavity of maxillary labial alveolar bone is related to the labial thickness of cortical bone in that area and to the presence of extraoral manifestations in the philtrum. The data presented in this work showed an increased maxillary labial concavity was related to the decreased thickness of the labial cortical wall and the presence of a horizontal groove at the philtrum area.