Methods: A stratified multi-stage random cluster sampling was designed for collecting 2324 children from 6 to 12 years old elementary school students. Every child received an oral examination by using WHO criteria (1997).
Results: The caries status of the primary teeth in the underweight and normal groups (caries prevalence = 64.95%°Bdeft index = 3.03) were higher than that of the obese group (caries prevalence = 45.56%°Bdeft index = 1.84). But the prevalence of caries in permanent teeth in the obese group (49.92%) is similar to that of the normal group (49.35%). Otherwise, the DMFT index in permanent teeth in the obese group (DMFT index = 1.93) was more severe than that of the normal group (DMFT index = 1.34). The result of the dietary and brushing habits were analysis by the linear regression showed that the deft index was related to sex, age, degree of obesity, fried foods, potato chips, cookies, and fruits. The DMFT index was related to sex, age, sugar and chocolate, cookies, ice cream, ice bar, and instant noodles.
Conclusions: The conclusion of this study is that the obese children had high DMFT index and the DMFT index is related to the sugar-containing foods.