Objectives: Since most oral diseases are not life threatening, it can be assumed that an individual`s behavior to maintain one`s oral health is most likely influenced by one`s oral health knowledge. Methods: Mothers whose children are attending five kindergartens and child care facilities in the city of Danjin, Chungnam were selected as subjects of this study. Out of a total of 230 questionnaires collected. A self-administered survey was conducted from April 1 to April 30, 2012. The data were analyzed using SPSS 19.0 (SPSS 19.0 K for window, SPSS Inc, USA) with the level of significance as 0.05. Results: 1. Most of the participants correctly answered questions on the oral health knowledge with a mean of 7.37 out of 9. 2. In the section of caring a child`s oral health behavior, ``caring a child to brush his or her teeth three times a day`` had the highest score of 3.45 out of 5. 3. Looking at caring a child`s oral health behavior and a mother`s oral health knowledge by general characteristics of mothers, there were no significant differences based on the mother`s age, whether a mother is currently working or not, her level of education, and her monthly average income. Conclusions: Based on the above results, we can draw a conclusion that the lower the difference between the rate of correct answers and that of incorrect answers on mother`s oral health knowledge to her child, the higher the mother`s score of caring her child`s oral health behavior, leading to better caring.