Purpose: The purpose of this study was to analyze level of dental health knowledge and behavior of mothers, health educators should encourage mother to have continuous dental care habits for lifelong dental health with practical education. Methods: The subjects in this study were 490 mothers of four-year, fifth-year and sixth-year from elementary school in Daegu areas. The data was collected through a structured questionnaire from 26, June to 27, June 2006. Collected data were analyzed into frequency and Chi-square test using SPSS 10.0 program. Result: First, no statistically significant relations were found between mothers, knowledge with general characteristics of subject(age, degree of education, yes or no of occupation, subjective economy). Second, mothers, number of toothbrushing were statistically significant relations with degree of education, yes or no of occupation as over three times a day. Third, no statistically significant relations were between visiting frequency of dental clinic for one years with general characteristics of subject(age, degree of education, yes or no of occupation, subjective economy). Fourth, yes or no of use in auxiliary oral hygiene device were statistically significant relations with degree of education, yes or no of occupation, subjective economy. Fifth, mothers, knowledge were statistically significant relations with auxiliary oral hygiene device.