The object of this study is to contribute to the debate within the sociology of education surrounding contemporary challenges regarding the guarantee of the right of education to children and adolescents in Brazil. It is based on the premise that when the relationship with formal schooling is threatened by their social, geographical, family, or even educational contexts, it often leads them to temporarily or permanently leave school, which reveals a sociological agenda of investigation. Keeping in mind the significant advancements in formal education in Brazil, it is especially important to better investigate the reasons behind the fact that approximately 1.5 million children and adolescents between 4 and 17 years old are not attending school. The analysis of the impacts of social exclusion on Brazilian childhoods and youths brings relevant elements to the construction of the idea of school exclusion as a phenomenon produced by the perverse effects of social inequality on peripheral school trajectories. In addition, this work focused on a case study carried out in the municipality of Rio de Janeiro through a social project that worked over three years with the active search for children and adolescents in a situation of school disengagement in partnership with the management municipal. The project identified 23,735 cases across the city and produced a detailed database on each of them through a fieldwork strategy, mediation with public policies and social mobilization. When investigating the situations mapped by the project, it was possible to carry out an analysis that pointed out the profile of this public and inventoried the situations of school exclusion, indicating its relationship with the aspects of the broader social exclusion that is manifested by constraints to other fundamental human rights, such as the rights to the city, to security, to housing, transportation, health, assistance, food, work, culture, and ultimately, to the right to one s own life and physical integrity, among others. From a systemic perspective, the fragility of the relationship between peripheral families and the public educational and assistance systems has proved to be an exclusion factor, central in the study. The problems related to the provision of school places suitable to family needs, constraints related to circulation in the city territories, deficient family income and extreme poverty were highlighted. Thus, the work points out issues that contribute to the improvement of social and educational policies, inserting itself into a debate about the importance of integration between public policies in the direction of strengthening a comprehensive protection network for children and adolescents, under the legal framework supported by the Brazilian Federal Constitution (1988) and its legacy of affirming citizenship for all. The right to education appears as an axis around other human rights gravitate, functioning as an important indicator of life quality or social exclusion of children, adolescents and their families.