Objectives: This study is aimed to evaluate oral health knowledge and behavior according to subjective awareness characteristics of oral health in university student. Methods: The data was collected from June, 2015 in K university, Korea. It was investigated about subjective awareness characteristics, knowledge and behavior of oral health by questionnaires in university students. The data was analysis into t-test and one-way ANOVA by SPSS 22.0. Results: Subjects who responded that they had a problem with oral health in subjective awareness characteristics were a statistically significant differences according to gender. Subjects who were interested of oral health and responded to their subjective oral health state as good condition were higher than the others in oral health knowledge. According to subjective awareness characteristics of oral health, the oral health behaviors were a statistically significant differences. Conclusions: There were statistically significant differences in oral health knowledge and behavior according to subjective awareness characteristics of oral health.