Oral health status of elderly residents in long-term care facilities and oral care experiences and educational needs of caregivers: A mixed methods study - Min-Joo Shin; Jae-Hun Koh; Eun-Jae Choi; Hye-Jin Kwon; Seon-Jip Kim; Hyo-Jin Lee; Hyewon Suh; Jijun Lim; Jung-Ah Lee; Hyun-Jae Cho (Journal of Korean Dental Association, 2026)