Objectives: This study examined differences in the use of oral hygiene devices according to education level among Korean adults. Methods: Data from 4,472 adults aged 19 years and older in the 9th Korea National Health and Nutrition Examination Survey (2022) were analyzed using complex sample frequency, the Rao–Scott chi-square test, and multiple logistic regression analyses. Results: The use of oral hygiene devices increased significantly with higher education levels (p<0.001). Individuals who had undergone a dental check-up within the past year showed higher usage across all education groups (p<0.001). However, among adults with a college education or higher, oral hygiene device use showed a declining trend in the older age groups (p<0.001). Logistic regression analysis revealed that higher education (college or above: odds ratio=2.60; high school: odds ratio =1.87), female sex (odds ratio =1.86), younger age, presence of implants, absence of denture need, and recent dental visits were significant predictors of device use (p<0.001). Conclusions: Education level was significantly associated with the use of oral hygiene devices, along with age, sex, and preventive dental care utilization. Targeted education and improved access to oral hygiene devices that address the specific needs of individuals with lower education levels and older adults should be considered to reduce oral health disparities.