Behavior management of the child constitutes an important part of pediatric dentistry. The majority of children can be treated with adequate behavior management. However, some children who have extensive dental problems or mental, physical disabilities cannot cooperate. So, the need for general anesthesia as a special method of behavior management has increased recently. This study analyzes the records of patients who received dental treatment under general anesthesia. The 1378 cases of 1322 patients under 18 years of age, who received dental treatment under general anesthesia in department of pediatric dentistry at the Seoul National University dental hospital, from October, 2011 to December, 2015 were included. In this study, male (60.9%) was more than female (39.1%). The mean age of patients was 5.9 years and age from 5 to 9 years was the most frequent (56.0%). The primary dental treatment which patients received was dental caries treatment (51.1%), followed by surgical treatment (42.2%). The dental treatment under general anesthesia has many advantages including of performing a lot of treatments at once, producing good quality of treatment, and reducing the number of visits. General anesthesia may be a useful method of behavior management.