Faustino-Silva DD, et al. - In this randomized cluster trial, researchers examined the differential preventive impact of motivational interviewing (MI) on early childhood caries based on socioeconomic variables using a community-based trial in a public healthcare setting. One hundred and eighty-six were involved in the conventional oral health education (CE) group and 228 in the MI group. The impact of MI on the caries outcome vs CE was assessed in different subgroups: family income, mother's education and skin colour. Data reported that the caries rate per 100 surface-year was 1.29 in the CE group and 0.46 in the MI group. In children whose families are of lower-income, MI had a greater preventive impact against caries.