SummaryBackground/Aim: The purpose of this report is to present an unusual case of failure of eruption of a second deciduous molar and its management.Case Report: An 8-year-old boy presented with a complaint of a missing tooth. Radiographic examination revealed the second deciduous molar was impacted without any mechanical obstacles, like an odontoma or supernumerary teeth, being present.Conclusions: The case presented in this report is of scientific relevance due to the rarity of this type of pathology and the interesting histopathology.