The prevalence of dental caries among primary school children in Medan city is substantially high. The primary objective of this study was to analyze the relationship between the salivary parameters, caries status and nutritional status of the primary school children in Medan city. This cross-sectional study utilized a sample of 75 children aged 6 to 12 years old. The salivary parameters of each child were measured using the GC Saliva-Check Kit and the caries status was subsequently measured according to the tenets of the World Health Organization (WHO). The recorded mean body mass index (BMI) was 12.43 kg/m 2 for the underweight group, 16.33 kg/m 2 for the normal group, and 25.64 kg/m 2 for the obese group. The mean deft value for the underweight group was 2.68±3.61, for the normal group was 1.16±1.59, and for the obese group was 2.04±2.92. The mean DMFT value for the underweight group was 2.44±2.08, for the normal group was 1.16±1.17, and for the obese group was 2.12±2.29. There was a significant difference in saliva volume, flow rate, and pH between the underweight, normal, and obese children. This study had conclusively proven that BMI has a significant impact on the salivary parameters and caries status in children.