A clinical survey was conducted of patients who visited the clinic of the Department of Pediatric Dentistry at the Dental Hospital of Nihon University School of Dentistry and underwent dental treatment under general anesthesia from January 2003 to December 2012. The results are as follows.1.Survey results were obtained for 199 boys and 103 girls, with an average age of 5 years 4 months.2.Of the 311 cases, 246 were children with systemic diseases or normal children who were noncooperative with dental treatment. Thirty-seven were disabled and 28 were children who had difficulties with repeated visits to the dental hospital.3.The 37 cases were comprised of children with autism (n＝20), uncomplicated mental retardation (n ＝12), Down syndrome (n＝1), mental retardation with epilepsy (n＝1), mental retardation with cerebral palsy (n＝1), 18 p syndrome (n＝1), and Williams syndrome (n＝1).4.Of all 311 patients, 222 underwent dental treatment on an outpatient basis. The average anesthesia administration time was 2 hours 21 minutes.The average number of restored teeth per case was 10.7. Furthermore, the average number of teeth per patient restored with composite resin was 5.4, while that of teeth that underwent endodontic therapy and extraction were 1.6 and 1.4, respectively.