ABSTRACT
Objective To investigate the prevalence of primary teeth caries and oral hygiene status of preschool children in Kunming.Methods 6958 children aged 3-5 years from 30 kindergartens in Kunming were randomly selected for this study.The reserch of caries prevalence rate and soft dirt were investigated.Results The caries prevalence rate and the mean decayed,missing and filled teeth (XDMFT) values in primary teeth were 58.68％and 2.61 respectively.We can see the difference of significant between Dental caries prevalence and mean debris index simplified ( DI - S) scores between age groups, and there was no statistical significance of the same index between sex. There was no correlation between the investigation of dental caries and oral hygiene status. Conclusion The caries prevalence rate in 3-5 year-old children in the downtown area of Kunming city is very high,pointing out that preventive treatment against primary teeth caries should be strengthened.