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This population-based cross-sectional study included 1,064 randomized participants (aged 18 to 95 years, 617 females\/447 males). Sociodemographic, behaviours and medical information were recorded. Periodontal conditions were assessed with a full-mouth circumferential periodontal examination. It was used the American Association of Periodontology\/European Federation of Periodontology 2017 case definitions. A logistic regression analysis was applied to ascertain hypothetical risk factors towards periodontitis. The prevalence of periodontitis was 59.9%, with 24.0% and 22.2% of the participants exhibiting severe and moderate periodontitis, respectively. The risk of periodontitis significantly increased with age (OR\u2009=\u20091.05, 95% CI: 1.04\u20131.06), for active and former smokers (OR\u2009=\u20093.76 and OR\u2009=\u20092.11, respectively), with lower education levels (OR\u2009=\u20092.08, OR\u2009=\u20091.86, for middle and elementary education, respectively) and with diabetes mellitus (OR\u2009=\u20091.53). This study confirms a high burden of periodontitis in the target (Portuguese) sub-population. 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