The association of food insecurity with tooth decay and periodontitis among middle-aged and older adults in the United States and Korea

Introduction Food insecurity is an important social determinant of health, but there is limited understanding of its relationship with adult oral health. This study examined the associations between food insecurity and dental diseases (caries and periodontitis) among middle-aged and older adults in the United States and South Korea. Methods This study focused on middle-aged (40-59 years) and older adults (>59 years) who participated in the 2011-2016 US National Health and Nutrition Examination Surveys (NHANES) or the 2013-2015 South Korean NHANES. The exposure was food insecurity severity (food secure/early-stage food insecurity/middle-stage or severe food insecurity) assessed using the 18-item US Household Food Security Survey Module. The two outcomes were any untreated tooth decay and periodontitis measured using the Modified Community Periodontal Index of Treatment Needs. Covariate-adjusted odds ratios (OR) with 95% confidence intervals (CI) were generated using multivariable logistic regression models. Results Middle or severe food insecurity was associated with significantly higher odds of having untreated tooth decay than no food insecurity, but only among middle-aged adults in the United States (OR: 1.4, 95% CI 1.2, 1.9; P = .037) and Korea (OR = 1.8; 95% CI:1.0, 3.2; P = .036) and older adults in the United States (OR: 2.6, 95% CI 1.7, 4.0; P < .001). The associations between food insecurity and periodontitis were inconsistent across age group and country. Conclusion Differing cultural norms and access to dental services in the United States and South Korea may influence the relationship between food insecurity and oral health. Future research should explore how addressing food insecurity could help to promote the oral health of middle-aged and older adults in diverse sociocultural contexts.