Ameloblastic fibroma (AF) is a relatively uncommon benign neoplasm of odontogenic origin comprising about 1.5–4.5% of all odontogenic tumors, consists of odontogenic ectomesenchyme resembling the dental papilla and epithelial strands and nests resembling the dental lamina and enamel organ. Occurs most often during the first 2 decades of life, as a hard, painless mass of slow growth associates with an unerupted teeth, mainly localizated in the posterior mandible. AF was considered a hamartoma based on the theory of maturation of odontomas. It had been reported low recurrence as well as malignant transformation in young patients when they are treated by conservative procedures including enucleation, curettage and simple excision, preserving peripheral bone and periostium. We report a case of a 9 years old male patient with a right mandibular FA treated with an intraoral approach, excision caring of the thin cortical and periostium and curettage. This allowed adequate bone repair that was evident up to 3 years follow up.