Stevens-Johnson syndrome (SJS) and toxic epidermal necrolysis (TEN) are severe mucocutaneous reactions which are most frequently caused by drugs. Although the incidence of SJS and TEN is known to be relatively low, outcomes may be fatal. A systematic approach is required because morbidity rate is currently increasing and oral lesion is frequent. We investigated the clinical features and outcomes of 6 patients diagnosed as SJS and TEN and referred from the department of dermatology, Chonnam National University Hospital for oral care. Ketoconazol, Ofloxacin, Chlorphenesin, Amoxicillin, Pontal, Harnal, and Ciprofloxacin were suspected as the causative drugs. Average treatment period was 3.2 weeks, and two patients were referred to `burn-patients` hospital. Most of oral lesion were cured to be normal tissue, but scars with discoloration were observed. For intraoral management, antibiotic disinfection and steroid application were performed according to systemic treatment principles. Additionally, ingestion of zinc, antioxidants, and vitamin was recommended. The establishment of oral treatment principles is demanded because it has not been yet. Also, through investigation of drug side effect and careful prescription are required.