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Objectives: The aim of this study was to assess the effects of oral health behaviors(HB) and dental service use(DSU) on the association between dental treatment needs and socioeconomic status. Methods: A random sample of 10,000 observations from data of 968,466 Korean government employees examined by the National Health Insurance Corporation(NHIC) in the year 2000 was obtained. The dependent variables were dental treatment needs for dental caries, periodontal disease, missing teeth with no prosthetic replacement. We conducted bivariate analysis using chi-square test and multivariate logistic regression to determine the significance of effects. Results: The strong association between dental treatment needs and socioeconomic status was not significantly attenuated by adjusting HD and DSU. Compare to persons in high-income group, persons in medium or low-income groups were more likely to have dental treatment needs(odds ratio(OR), 95% confidence interval(95% CI): 1.3, 1.1-1.5) under adjustment for sociodemographic factors, HD and DSU. Need for prosthetic treatment was explained the most by the model with socioeconomic factors, sociodemographic factors, HD and DSU among other kinds of treatment needs evaluated by c-statistics and other measures of fit. Conclusion: Because of the strong association with socioeconomic factors, improvement of oral health by behavioral change might be limited.