Aim: The aim of this study was to investigate the relationship between Body Mass Index (BMI) and mean DMFT score of 12 year old school children in Ohrid city. 

Materials and Methods: This cross-sectional study assessed school children aged 12 years with measurement of the DMFT (Decayed, Missed, and Filled Teeth) dental indexes and BMI (Body-Mass Indexes) analyzed during four months period in 2014 year. Anthropometric measurements: the height and weight of the participants were determined according to standard criteria. Depending on their nutritional status, the subjects were categorized, as being ‘normal weight,’ "at risk of overweight" and "overweight". 

Results: In the group of 102 12-year-old children, 55 children were with normal weight, 25 children were at risk of overweight and 22 overweight children. The majority of the children were having normal weight (BMI < 20.50) with 21.57% classified as overweight (BMI 24.35−34.53) and 25.49% at risk of overweight obese (BMI 20.5024.35). The mean DMFT score of the 12 year old children from city Ohrid was 2.25±2.17. The mean DMFT score between the children with normal weight was 2.53±2.27, between the overweight children was 2.32±2.46 and while between the children at risk of overweight was 1.6±1.55. The children with normal weight had highest DMFT score. The difference between the average DMFT scores between the children with normal weight and the overweight children was not statistically significant. Children at risk of overweight were with lowest DMFT score.  

Conclusion: Being overweight was found to be negatively associated with mean DMFT in primary school children from Ohrid city. 

Keywords: Body Mass Index; Dental Caries; School Children.