This study was conducted to evaluated the effects of improvement on dental health behavior and dental health knowledge of adult group through dental health education program, the study subjects were 75, education group being 37(male 19, female 18) and non-education group being 38(male 19, female 19). who being in 2 office. The results of this study were as follow: 1. In the primary survey, the education group and non-education group showed no differences in sex, age, job year, income, smoking, self-rated dental health statues, DMFT index, a number of cervical abrasion tooth, dental health behavior, dental health knowledge. 2. before education program the use of tooth brushing method of horizontal+vertical was 40.6%, after education program the use of tooth brushing method of rolling was 89.2% in education group. 3. after education program the tooth brushing times was increased after-meal brushing, especially increased from 40.5% to 93.8% at after midday meal brushing. 4. the difference of mean change of dental health knowledge score after oral health education program had been studied. dental health knowledge score increased in 9.8 in the education group and non-education group in 1.6(pE0.001). 5. the difference of mean change of oral health promotion behavior after oral health education program had been studied, the frequence of tooth brushing(pE0.05), flossing(pE0.001), tongue brushing(pE0.001) was significantly increased in education group compare to non-education group. Above findings suggest that dental health education program was effective in improving the dental health behavior, dental health knowledge of the adult group.