Purpose: To assess the oral hygiene and periodontal status and analyse the influence of age, education, institutionalization, type of visit and oral health behaviour on oral hygiene and periodontal status among detainees in juvenile detention center in Udaipur city, Rajasthan, India. Materials and Methods: The total sample comprised 223 subjects (67.7% male and 32.3% female) aged 6 to 18 years. Clinical examination included assessment of oral hygiene and periodontal status using OHI-S (Oral Hygiene Index-Simplified) and CPI (Community Periodontal Index), respectively. Analysis of variance (ANOVA), chi-square, Student t-test and stepwise multiple linear and multiple logistic regression analysis were carried out to find the relation between oral hygiene/ periodontal status and different independent variables. Results: The results showed that the oral hygiene status of detainees was poor, with only 28.1% of the subjects having good oral hygiene. Mean OHI-S scores were significantly associated with all independent variables. Overall periodontal disease prevalence was 80.2% with bleeding and calculus contributing a major part (71.9%). Stepwise multiple linear and logistic regression analysis revealed that oral hygiene practice and type of visit in the detention center were the best predictors for the oral hygiene index, and for periodontal disease it was oral hygiene practice alone. Conclusion: The findings confirmed that detainees in the juvenile detention center have poor oral hygiene and an increased prevalence of periodontal disease compared to that of similarly ages in the general population. Keywords: juvenile delinquency, oral hygiene, periodontal status, prisoners