Objectives: This study examined oral symptoms, dental care behaviors, awareness and experience of government-supported dental treatment, and awareness of oral health management among 409 single-person households from a well-aging perspective. Methods: Data were analyzed using frequencies, percentages, and chi-square tests. Results: Overall, 74.3% of participants reported low levels of social and leisure activity participation. The most commonly reported oral symptoms were tooth sensitivity (25.7%), bad breath (21.0%), darkened tooth color (21.0%), dental caries (20.8%), and dry mouth (20.3%), whereas 27.9% reported no current oral symptoms. Age-group differences were not significant for immediate dental treatment when toothache occurred or for regular dental check-ups within 6-12 months. However, significant age-group differences were found in the experience of preventive dental treatment (χ² = 10.359, p = 0.035), awareness of government-supported implant, denture, or scaling treatment (χ² = 24.241, p < 0.001), and experience of such treatment (χ² = 12.804, p = 0.012). Awareness of oral health management methods did not significantly differ according to gender, age, residential area, education level, or duration of single-person household, but differed significantly according to social and leisure activity participation (χ² = 11.386, p = 0.003). Conclusions: Participants with higher levels of social and leisure activity participation were more likely to report being aware of oral health management methods and less likely to report being unaware. These findings suggest that oral health in single-person households is associated not only with current symptoms but also with preventive dental utilization, policy awareness, and social connectedness. Community-based strategies for well-aging should therefore strengthen early symptom management, age-tailored preventive dental services, and practical oral health education for single-person households.