Hereditary gingival fibromatosis (FGH) is a gingival pathology of genetic origin characterized by a slow and progressive proliferation of the keratinized gingiva. The diagnosis is clinical, confirmed by histology. The treatment is surgical and involves the excision of excess tissue with gingivoplasty, but the recurrence rate remains high, especially in severe cases. We report a case of generalized FGH, whose evolution was favorable after surgical treatment. Observation: A 42-year-old patient, with no notable history, who presented in our consultation for a gingival hypertrophy evolving since childhood. Endobuccal examination showed diffuse gingival hypertrophy with poor oral status. Gingival biopsy revealed gingival fibromatosis. Treatment consisted of excision of excess tissue with gingivoplasty. No recidivism after a decline of three years. Discussion: FGH is a genetic gingival pathology whose clinical appearance is variable, it may be generalized or localized to a maxillary sector, isolated or associated. The positive diagnosis is mostly clinical confirmed by histology (hyperplastic epithelium and dense connective tissue), the treatment is surgical and consists of excision of excess gingival tissue with gingivoplasty. Our patient has a severe FGH that has evolved after surgical treatment