Dental caries is one of the most prevalent chronic illnesses in early childhood, with repercussions on minors' quality of life. This vital stage constitutes an opportunity for children to acquire oral hygiene habits and control over them, especially in social vulnerability contexts. Objective: To analyze parents' beliefs about their ability to support their children in developing dental hygiene habits and children's beliefs about the acquisition of these habits before and after completing a dental hygiene development program. We established a quasi-experimental design with pre-test and post-test for two groups: parents and their preschool-age children participating in an educational program focused on developing dental hygiene habits in Mexico. We compared the habits, self-efficacy, intention and control on oral hygiene, through a paired t-test analysis. Results: The findings showed that...