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These individuals are particularly susceptible to deficiencies in social capital, one of the key social determinants of health. However, research on the relationship between social capital and oral health among older adults living alone remains limited. Therefore, this study aims to analyze the factors associated with oral health in this population, with a specific focus on social capital.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Methods<\/jats:title>\n            <jats:p>This study analyzed data from the Korean Community Health Survey, 2023, focusing on 21,677 older adults aged 65 and over living alone. The dependent variable was subjective oral health level, while independent variables included social capital factors such as trust, reciprocity, social network, and social participation. Hierarchical logistic regression analysis was conducted to investigate the relationship between social capital and subjective oral health levels, with results presented as odds ratios and 95% confidence intervals.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Results<\/jats:title>\n            <jats:p>Older adults aged 65 and over living alone were found to be particularly vulnerable to poor subjective oral health, especially those with older age, lower educational attainment, lower income levels, lack of economic activity, and residence in rural areas. Among the social capital variables, the analysis showed that individuals without reciprocity had 1.30 times higher odds of worse subjective oral health compared to those with reciprocity (OR\u2009=\u20091.30, 95% CI 1.18\u20131.42). Similarly, individuals without social participation had 1.31 times higher odds of worse subjective oral health compared to those with social participation (OR\u2009=\u20091.31, 95% CI 1.21\u20131.42).<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Conclusions<\/jats:title>\n            <jats:p>Social capital is significantly associated with the subjective oral health levels of older adults aged 65 and over living alone. This emphasizes the importance of enhancing social capital to mitigate oral health inequalities among socially vulnerable older adults living alone.<\/jats:p>\n          <\/jats:sec>","DOI":"10.1186\/s12889-025-22649-9","type":"journal-article","created":{"date-parts":[[2025,4,15]],"date-time":"2025-04-15T04:25:55Z","timestamp":1744691155000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Factors associated with subjective oral health among older adults aged 65 and over living alone: the role of social capital"],"prefix":"10.1186","volume":"25","author":[{"given":"Eun-Ju","family":"Park","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yoon Min","family":"Gil","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2025,4,15]]},"reference":[{"issue":"1","key":"22649_CR1","doi-asserted-by":"publisher","first-page":"S95","DOI":"10.1086\/228943","volume":"94","author":"JS Coleman","year":"1988","unstructured":"Coleman JS. 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