Objective: To determine the impact of Minimal Intervention Techniques (MIT) on the body mass index (BMI) of preschool children with early childhood caries (CIT). Material and Methods: Intervention, relational and longitudinal study. A random sample of 31 was obtained from a population of 100 pre-school children of both sexes and ages 3 to 5 who met the inclusion criteria. Anthropometric measurements were recorded: height- weight and BMI at the beginning, 6 and 12 months. The soft tissue oral examination revealed color changes and gingivitis; in hard tissues alterations of structure, chronology, sequence of eruption and the ceo-d index was applied; clinical evaluations were at baseline and at 12 months. Preventive MITs were applied: fluoride in varnish, microinvasive: ionomeric sealants and minimally invasive: Atraumatic Restoration Technique (ART). Results: The global and individual vari...