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<i>Background and Objectives:</i> Cerebral aneurysms can cause disability or death during rupture, but information on the etiology of cerebral aneurysms is currently lacking. Periodontal disease causes both systemic inflammation and local inflammation of the oral cavity. Systemic inflammation is a major cause of cerebral aneurysms. The aim of our study was to determine whether the presence of periodontal disease is related to the occurrence of unruptured cerebral aneurysms in a nationwide population-based cohort. <i>Materials and Methods:</i> We analyzed data on demographics, previous medical history, and laboratory test results of 209,620 participants from the Korean National Health Insurance System-Health Screening Cohort. The presence of periodontal disease and oral hygiene parameters, including the number of lost teeth, tooth brushing frequency per day, dental visits for any reason, and expert teeth scaling, were investigated. The occurrences of unruptured cerebral aneurysms (I67.1) were defined according to the International Statistical Classification of Diseases Related Health Problems-10. <i>Results:</i> The mean age of the participants was 53.7 ± 8.7 years, and 59.4% were male. Periodontal disease was found in 20.9% of the participants. A total of 2160 (1.0%) cases of unruptured cerebral aneurysms developed after 10.3 years of median follow up. In multivariate analysis, the presence of periodontal disease was significantly associated with an increased risk of unruptured cerebral aneurysms (hazard ratio: 1.21, 95% confidence interval: 1.09–1.34, <i>p</i> < 0.001). <i>Conclusion:</i> The presence of periodontal disease could be associated with the occurrence of unruptured cerebral aneurysms. It should be noted that when periodontal diseases are present, the risk of aneurysms is increased in the future.<textarea style="width: 1px; height: 1px; display: none;" id="BFI_DATA"></textarea> <title></title> <textarea id="BFI_DATA" style="width: 1px; height: 1px; display: none;"></textarea> <title></title> <textarea style="width: 1px; height: 1px; display: none;" id="BFI_DATA"></textarea> <title></title> <textarea id="BFI_DATA" style="width: 1px; height: 1px; display: none;"></textarea> <title></title> <div id="WidgetFloaterPanels" translate="no" style="display: none; text-align: left; direction: ltr; visibility: hidden;" class="LTRStyle"> <div id="WidgetFloater" style="display: none;" onmouseover="Microsoft.Translator.OnMouseOverFloater()" onmouseout="Microsoft.Translator.OnMouseOutFloater()"> <div id="WidgetLogoPanel"><span id="WidgetTranslateWithSpan"><span>TRANSLATE with </span><img id="FloaterLogo" /></span> <span id="WidgetCloseButton" title="Exit Translation" 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