. Odontomas are further subdivided into compound and complex types depending on the extent of morpho differentiation or on the resemblance to normal teeth [4] . The compound odontome is composed of multiple small tooth like structures, the complex odontome consist of a conglomerate mass of enamel and dentine, which bears no anatomical resemblance to the tooth [3] . The eruption and infection of odontoma are uncommon, only few cases of erupted odontome are reported in the literature. We report a rare unusual case of an infected complex odontoma with concomitant eruption of odontoma in the oral cavity involving perforation of the mucosa with an impacted third molar which makes the presentation unusual. We also highlighted the significance of proper diagnosis as most of these rare tumors go unnoticed with incorrect treatment to the patient. The dentist should be familiar with common and unusual appearances of odontomas for proper diagnosis and management.