Paper Title
Evaluation of Decayed, Missing and Filled Teeth (DMFT) Index in the 12 Years Old Students of Tehran City, Iran

Abstract
The present study aimed to evaluate o Decayed, Missing and Filled Teeth (DMFT) Index among 12- year-old students in Tehran and identify the related factors which affect dental caries. Methods: A cross-sectional survey was conducted. First, the status of dental caries was assessed in terms of decayed teeth (DT), filled teeth (FT) and decayed, missing and filled teeth (DMFT). Then, a multivariate regression analysis was used to determine the relationship between DMFT and other variables (p < 0.05). Results: A total of 416 respondents participated in the study. The mean age was10.94 (SD=0.628) years, and the mean of DMFT was 1.03 (SD=1.41). DT (0.53 ± 0.95) had the highest and MT (0.14 ± 0.47) had the lowest mean. The results indicated a significant relationship between high DMFT scores and the variables such as increasing age, lower levels of mother's education, higher family income, lower frequency of tooth brushing and dental flossing, having a history of no visit to the dentist (P<0.05). Conclusion: Based on the results, Iranian female students had a poor oral health behavior, as few used dental floss on a regular basis. However, a significant relationship was observed between caries scores and demographic factors such as age and socio-behavioral variables including family income, the level of mothers' education, the frequency of dental brushing and flossing, as well as the frequency and type of visiting a dentist. Keywords - Oral Health. Dental Caries. Students. School.