Aims: The aims of this eross-sectional study were to describe the level of dental fear and to assess the relationship between primary dental caries and dental fearin 7-year-old children at Phu Lam Primary School, Ha Dong, Ha Noi. Methods and Meterial: Tliis is a observational study, a eross-sedjonal study. Results: The prevalence of dental fear was 34.85%. Fear scores were highest for "Dentist drilling" (2.92 ± 1.47) and "Injections" (2.87 ± 1.53). In the children who had primary dental caries, there was no statistically significant difference between "dental fear" group and "without dental fear" group. Conclusion: The study showed the prevalence of dental fear in 7-year-old children. There were a high incidence of primary dental caries inthe group of children with dental fear.