Purpose: The purpose of this study was to examine the changes of oral health care awareness and behavior caused by the addition of dental scaling to the coverage list of the national health insurance system. Methods: A survey was conducted on 250 selected adults from March 15 to April 28, 2016, and the answer sheets from 230 respondents were analyzed. Results: As many as 77.0 percent answered they knew dental scaling became one of the health insurance benefits. As for satisfaction level before and after this change, 92.0 percent of those surveyed said were more satisfied after addition of dental scaling to the national health insurance system. The respondents who were more satisfied before the addition of dental scaling to the coverage list cited kind services as the major reason (65.4%), and the dominant reason that the others were more satisfied after the addition was low expenses (74.8%). The common reason that the latter was dissatisfied before that was the burden of expenses(86.8%), and the major reason that the former was dissatisfied after that was pain(64.3%). The common cycle of revisit after that was six months or less(45.5%). Conclusion: As the addition of dental scaling to the coverage list of the national health insurance system makes it possible to promote national oral health, the government should push ahead with more advanced and prolonged oral health care policies.