Trends of Oral Health Status of Older Adults by Immigration Status in the United States: 1999–2018

Introduction: This study examined oral health trends of older immigrants in the US from 1999 to 2018 and disparities between immigrants and non-immigrants across different races/ethnicities. Methods: Data were from the 1999–2018 National Health and Nutrition Survey (NHANES). Outcome variables were self-reported poor oral health and significant tooth loss (i.e., < 20 permanent teeth). Participants were categorized into three groups as US natives, naturalized citizens, or noncitizen residents. The analytical sample comprised 13,424 older adults (ages 60+), including 10,087 US natives, 2280 naturalized citizens, and 1057 noncitizen residents. We assessed the trends in poor oral health and significant tooth loss across the three groups and conducted analyses stratified by race/ethnicity to examine within-group disparities. Results: From 1999 to 2018, noncitizen residents consistently showed higher rates of poor oral health and significant tooth loss compared to US natives and naturalized citizens. Multiple logistic regression model results showed that naturalized citizens were less likely (AOR = 0.79, p = 0.03) to report poor oral health. Stratified analyses by racial/ethnic groups showed that among Blacks, naturalized citizens were less likely to report poor oral health (AOR = 0.59, p = 0.02) than Blacks who were born in the US. Conclusion: While overall oral health improved among older immigrants from 1999 to 2018, oral health disparities persisted, especially between noncitizen residents and US natives. There were significant differences in oral health between Black immigrants and their US-born counterparts. Future research is needed to corroborate these findings and monitor the trend of oral health disparities.