Objectives: The purpose of the study is to investigate the deciding factors of regular scaling checkup in metropolitan adults. Methods : The subjects were 395 adults of 20s to 50s in Seoul and Gyeonggi province from September 25 to October 4, 2012. Data were self-reported questionnaires. Results : Female tried to receive more regular scaling checkup than male. Dental practitioners were acquainted with the dental knowledge and had more scaling checkup. Those who received dental scaling checkup tended to use dental hygiene products and visit the dentists regularly. Those who receiving good dental health services tended to visit the dental clinics more frequently. Higher knowledge and lower fear of dental treatment lead to frequent regular checkup. There were significant positive correlations between satisfaction, kindness, knowledge of scaling and regular scaling checkup. Fear to dental treatment showed the negative correlation. Conclusions : In order to increase intention degree of regular scaling checkup, it is necessary to develop programs for proper oral health behavior and to improve patient care services by dental hygienist.