The purpose of this study was to investigate the relationship of power and empowerment, self-efficacy of dental hygienists. Date were obtained from 203 dental hygienists who were working at dental clinics, hospitals located in Seoul. The results were analyzed with spsswin 12.0 and the conclusion is as follows: 1. The level of dental hygienists formal power was 3.19, informal power was 3.41, empowerment was 3.12, self-efficacy was 3.67. 2. Formal power showed significant a positive correlation with informal power and informal power showed significant a positive correlation with empowerment 3. According to the position, there were significant differences in formal power(pE0.05). 4. According to the working place, age, experienced-years, position, marriage and turnover experience there were significant differences in informal power(pE0.05). S. According to the working place, position, and marriage there were significant differences in empowerment(pE0.05). 6. According to the age, experienced-years, position, marriage and turnover experience there were significant differences in self-efficacy(pE0.05). 7. Informal power and information structure accounted significantly for the self-efficacy.