Abstract: Objective: To analysis the prevalence of dental caries in primary school students, and to summary the risk factors. Methods: 2165 students of 3 primary schools were selected as sample, who were carried out the caries examination. A questionnaire survey was conducted to investigate the risk factors of dental caries among pupils and their parents. Results: A total of 2165 questionnaires were issued and 2138 were recovered, with an effective recovery rate of 98.8%. 2032 students had decayed teeth, and the caries rate was 95%. The lower the age, the higher the number of caries in pupils, and the caries rate at different ages was statistically significant (P<0.05). The parents' education level, brushing habits, bedtime eating sweets, often eating sweets, often drinking carbonated drinks, and nearly 12 months to carry out oral examination were risk factors for primary caries. Conclusion: The problem of dental caries in primary school students is serious. It is necessary to increase the awareness of parents, change the habit of brushing teeth and eating, and urge the oral examination to inhibit the occurrence of dental caries.

Key words: Pupil, Dental caries, Clinical investigation, Risk factors