Florid cementum-bone dysplasia is a benign fibro-bone lesion found in the support areas of the teeth without a neoplastic component. It has multifocal involvement throughout the mandibular region. It is bilateral and is present in all quadrants with a periapical pattern. More than 90% of patients are black women in their 50s. Asians are also affected. It is usually asymptomatic and is mostly a radiographic finding. When there is pain it is of low intensity. Radiographically, the lesions may be radiolucent, mixed or radiopaque. Affects areas with teeth and edentulous areas. Case report of a healthy female patient, Brazilian nationality, black, 35 years old. She had her first appointment at the university stomatology clinic in 2009, after being referred by a dentist who had performed orthopantomography to begin orthodontic treatment. The patient was asymptomatic. Extraoral examination showed no changes. In the intraoral examination, only a few teeth were restored. Radiographically, multiple radiolucent and multiple radiopaque mixed lesions were visualised, involving the anterior and posterior regions of the mandible. This clinical and radiographic picture was compatible with florid cementum-bone dysplasia. The annual follow-up of the patient is performed. At 2018 follow-up, nine years after the pathology was diagnosed, there was no regression of dysplasia and the patient remained asymptomatic. Given the clinical and radiographic characteristics of the lesion, the diagnosis was objective and there was no need for biopsy, being that non-neoplastic lesions do not require treatment. However, periodic follow-up of lesions and symptomatology should be maintained. The major complication described in the literature is the infection reported as osteomyelitis, in which the dentist should be alert. Implant placement is compromised. Orthodontic treatment is contraindicated. Schlagwörter: dysplasia, florid cementum dysplasia, oral medicine, benign lesion, radiopaque, radiolucent