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Objective: To assess the self-perception of adolescents in conflict with the law about their concern with oral health, in addition to tracing their relationship with other related variables. Methods: A cross-sectional study involving male institutionalized adolescents in a city in southern Brazil who underwent clinical examination and interviews to understand their concern for their oral health and the relationship between this outcome and associated factors. Concern about oral health was obtained through a validated questionnaire. Two fitted models were performed using Poisson regression (α < 0.05). One of them used the decayed, missing, and filled teeth index (DMF-D), and another considered the components of this index as exploratory variables. Results: Sixty-eight adolescents were included, and a high occurrence (75%) of concern about their oral health was observed. In the final multivariate analysis that included DMFT, this index (prevalence ratio [PR]: 1.033; 95% confidence interval [95%CI]: 1.004 – 1.063) and concern about tooth color (PR: 2.208; 95%CI: 1.028 – 4.740) were significantly associated with oral health concerns. When the various index components were included in the multivariate model, only the number of decayed teeth (PR: 1.073; 95%CI: 1.007 – 1.144) and concerns about tooth color (PR: 2.250; 95%CI: 1.057 – 4.793) were associated with the outcome. Conclusion: Institutionalized adolescents are highly concerned about their oral health, being associated with a DMF index, especially the decayed component, and a concern with the color of their teeth.