Hereditary gingival fibromatosis (HGF) is a rare benign, slowly progressive, non-inflammatory fibrous hyperplasia of the maxillary and mandibular gingivae that generally occurs with the eruption of the permanent (or more rarely the primary) dentition or even at birth. It presents as a localized or generalized, smooth or nodular overgrowth of the gingival tissues of varying severity. It can be isolated, with autosomal dominant inheritance, or as part of a syndrome. The disease is Monarch Disease Ontology entry MONDO_0016070 (hereditary gingival fibromatosis). Also known as: autosomal dominant gingival fibromatosis, autosomal dominant gingival hyperplasia, hereditary gingival hyperplasia.