Two cases of subpontic hyperostosis are presented. This condition is an intraoral bony exostosis that has been observed beneath a fixed partial denture. Subpontic hyperostosis seems to be associated exclusively with the posterior mandible, usually the first molar position. The first case occurred in a 64-yr-old Asian male and the second appeared bilaterally in a 79-yr-old female. It has not been described extensively in the literature, with only 33 cases having been reported previously. The etiology of this condition is unknown, with factors such as genetic predisposition, mechanical stress, and inflammation suggested as possible causes. Treatment of this hyperostosis is be surgical excision, and if necessary is usually due to the impingement of the growth on the pontic and the inability of the patient to maintain adequate oral hygiene in the area.