Oral disorders and eating disorders affect everyone, however, these will be more frequent in vulnerable populations such as native communities. Aim: Determining the body mass index and the prevalence of dental caries and its clinical consequences in native Peruvian communities. Methods: Observational, correlational, cross-sectional study. The sample consisted of 169 adults from the native communities selected for convenience, meeting inclusion and exclusion criteria. Nutritional status was evaluated through the body mass index, to quantify the experience of dental caries, the DMTF index was used, the severity was quantified by the significance index of dental caries, and its clinical consequences when not being treated by the PUFA index. The evaluation was carried out in natural light by calibrated observers. The data were analyzed in the STATA v 14 program using frequency distribution tables and figures, to determine the association, the Pearson's correlation coefficient was used. Results: The majority of residents had an adequate weight for their height 71 (41.01%), followed by low weight 64 (37.87%), overweight 29 (17.16%) and obesity 5 (2.96%). The prevalence of dental caries was 100% (DMTF = 13.23; SIC = 19.01), of which 68.04% had clinical consequences, no association was found between: BMI and DMTF (p = 0.557) BMI and PUFA-index (0.485). Conclusions: No association was found between the body mass index and dental caries and its clinical consequences.