Objectives: The purpose of the study was to investigate the factors affecting unmet dental care needs in requiring oral health problems and dental care patients. Methods: The study subjects were 3,213 oral health problems and dental care patients who participated in the first year of the Korea National Health and Nutrition Examination Survey (KNHANES 2015). The data were analyzed by frequency analysis, Rao- Scott chi-square test, t-test, and binary logistic regression analysis. data were analysis using IBM SPSS 25.0 program. Results: In multiple logistic regression analysis, the odds ratio (OR) for unmet dental care needs in middle school graduates (OR=1.39, 95% confidence interval, 95% CI=1.05-1.92), and high school graduates (OR=1.37, 95% CI= 1.03-1.83), and college graduates (OR=1.42, 95% CI=1.05-1.93) than below elementary school graduates. And unmet dental care needs in not economically active group (OR=1.25, 95% CI=1.01-1.55) than economic activity group had higher odds. Also, the odds ratio for unmet dental care needs in unmet medical needs group (OR=3.46, 95% CI=2.65-4.52) than receive medical care group had significantly higher odds. Conclusions: Those who are high learning group, and not economically active group, and unmet medical needs group had much higher unmet dental care needs. Further study is needed to analyze the association between unmet medical needs and unmet dental care needs.