Ameloblastic fibro-odontoma (AFO) is a mixed odontogenic tumor with a high prevalence in the first decade of life. It has a predilection for the male sex and is frequently located in the posterior area of the mandible. We present the case of a 6 year old boy who during his routine dental care was found to have a radiographic finding in the left mandibular angle, a lesion with defined limits and mixed density containing tooth germ 3.7, clinically with a discrete increase in left hemifacial volume, normal mucosa and asymptomatic. Surgical intervention was performed according to clinical and radiographic criteria, under diagnostic hypothesis of AFO, performing complete excision of the lesion, germ extraction and curettage of the area. The histopathological diagno- sis showed ameloblastic fibro-odontoma, without ruling out the possibility of being an odontoma in formation. The controversy of this entity and its current classification is discussed, because it is considered by some authors as an ameloblastic fibro-odontoma, by others as an odontoma in formation or a transition of both. The importance of periodic check-ups associated with it is also emphasized.