Hereditary gingival fibromatosis (HGF) is an uncommon gingival disease of attached gingiva, which is manifested as localized or generalized form. The HGF inheritance is transmitted through both autosomal dominant and recessive modes. Here, we are discussing a rare case report of an 8-year-old child with gingival fibromatosis in mixed dentition, which caused damage to his speech, mastication, and esthetics and led to significant change in his facial profile. The patient noticed that the gingival enlargement was simultaneous with deciduous dentition eruption and gradually covered entire dentition. Gingival enlargement covered all teeth anteriorly and posteriorly and only occlusal surfaces were visible. The enlarged tissue was resected by the external bevel gingivectomy under general anesthesia arch wise. The postoperative healing was satisfactory, uneventful, and there was significant change in patient's esthetics. Patient has been kept on regular recall visits.