Objectives: The study examined mothers` oral health knowledge and oral health management behavior to their children that affect directly children`s oral health to prepare basic aiming at children. Methods: Therefore, a survey of 235 mothers in 10 kindergartens located in Seoul was conducted by self-administered questionnaires. Results: As to mothers` oral health knowledge, the correct-answer rate for questions about tooth-decay was highest, and the level of `middle (5~7 points)` was the most common with 50.0%. Regarding oral health knowledge according to mothers` general characteristics, the higher academic background and family`s monthly earnings were, the higher oral health knowledge was. It showed a statistically significant difference(p<.01). In terms of mothers` oral health management behavior to their children, 79.1% of mothers who had the visiting experience in the dentist`s for caries prevention was highest. As to the number of brushing, the twice was highest with 51.2%, and regarding brushing time 2min was highest52.6%. Also, the rate of using the fluoride toothpaste was 68.4%, and the rate of mothers who helped their children`s brushing was 83.3%. As to the oral health management behavior to their children by mothers` oral health knowledge, mothers with higher oral health knowledge used the fluoride toothpaste showing that there was a significant difference(p<.01). Also, mothers with higher oral health knowledge helped more children`s brushing, so that there was a significant difference(p<.05). Regarding the oral health management behavior to their children according to mothers` visiting experience in the dentist`s, mothers who visited the dentist`s during the recent one year had higher visiting experience of dentist`s for children`s caries prevention(p<.01) and longer time of brushing by 3min(p<.05), and helped their children`s brushing a lot. The findings showed a significant difference(p<.001). Conclusions: As the results above, as mothers` oral health knowledge and oral health management behaviors to their children affect closely children`s oral health, more systematic, specific and active oral health programs should be provided to mothers.