Subpontic osseous hyperplasia is a relatively uncommon benign submucosal mass of normal bone found beneath a pontic. Three cases of mandibular subpontic osseous hyperplasia are described, adding to the 40 existing cases in the English-language literature. Subpontic osseous hyperplasia may represent a unique reactive osseous metaplasia in the subpontic region, with chronic stimuli and functional or occlusal stress as possible etiologies. This article aims to address the clinical significance, treatment considerations, and radiographic correlation of subpontic osseous hyperplasia. Keywords: bone, fixed prosthesis, metaplasia, subpontic osseous hyperplasia