A B S T R A C T Dentigerous cysts are odontogenic cysts associated with the crowns of unerupted permanent teeth. This article reports the case of a 10-year-old child who presented permanence of deciduous teeth 51, 52, and 53. Panoramic radiograph showed extensive cystic lesion involving the teeth 11, 12 and 13, which were included. Diagnosis of dentigerous cysts was confirmed by incisional biopsy and the treatment was chosen in order to preserve the associated permanent teeth. At 2 years of follow-up, the impacted teeth are positioning itself spontaneously toward its eruption and the patient was referred for orthodontic assessment.