In many developed countries, oral health has improved in older children in recent decade, but remains a significant problem in younger children. Knowledge, attitude and practice (KAP) elements play an important role in promotion of oral health. The aim of this study was to analyze the oral health KAP in 6-year-old children in private pre-school and its relationship with caries presentation in their oral cavity. In this cross-sectional study on 35 children aged 6-year-old from private pre-school, KAP of the subjects were assessed using modified adapted questionnaire and caries detection through dental check-up. Data were analyzed using Chi-squared test in SPSS version 21.0. Statistical significance was set at P< 0.05. Results of this study showed that the scores of children in knowledge, attitude and practice were 94.7 ± 5.7%, 71.4 ± 28.6% and 42.9 ± 57.1%, respectively. These children seem to have good oral health knowledge and attitude but not in term of practice. Among these children, the percentages of children presented with caries were 74.0 ± 26.0%. Practice showed to have significant relationship with caries experience among the children (P = 0.04) but not for knowledge and attitude. In conclusion, this study showed that 6-year-old children in private pre-school have good knowledge and attitude regarding oral health but oral health practice showed significant relationship with caries experience was not satisfactory. Furthermore, parent’s knowledge on children’s oral health should not be taken for granted as its play a big role on the educating and foster children’s good oral health practice. In addition, other external factors also should be considered instead of relying on KAP elements only in 6-year-old children.