INTRODUCTION: Oral lichenoid lesions (OLL) are lesions resembling oral lichen planus with a clinical appearance of lacy white reticular, erosive or plaque-like pattern seen in approximately 2% of the adult population (1-7). Its etiology includes amalgam fillings and dental restoration materials, chronic graft versus host disease, various drugs or autoimmune diseases such as lupus erythematosus. It has been claimed that the mercury in amalgam may cause OLL as a result of delayed-type hypersensitivity reaction. Because OLL can be a painful, persistent and premalign condition, it is very important to pursuit a treatable cause. In this case report, OLL lesions associated with amalgam restoration and the treatment plan and results of these lesions including the replacement of amalgam fillings are presented. CASE REPORT: A 39-year-old male patient applied to our clinic with the complaint of pain in his tooth. In the anamnesis taken from the patient; It was learned that he did not have any systemic disease, was not under any medication, and did not smoke. In the intraoral examination of the patient, mesio-occlusal filling in tooth 37 and disto-occlusal amalgam filling in tooth 46, reticular type white lesions suggestive of OLL were detected in both buccal mucosa. In the radiographic examination of the patient, a periapical lesion was observed at the apex of tooth 46. Root canal treatment in tooth 46 and amalgam filling replacement in tooth 37 was considered due to the presence of OLL lesions in the buccal mucosa of the patient. The patient's related teeth were treated and the fillings were replaced with composite restorations. In the follow-up of the patient approximately 1 month later, it was observed that the white lesions on the buccal mucosa regressed. CONCLUSIONS: In the literature, as a result of the replacement of the amalgam restoration with composite fillings, it has been demonstrated that OLL cases due to dental amalgam restorations gave positive results and the lesion regressed. Since OLL has a risk of premalignant transformation, careful differential diagnosis of the lesion, early diagnosis, and treatment are very important.