noun 다운로드 🔗공유 치주학 The study of supporting structures of teeth—gums, alveolar bone, cementum, and the periodontal ligament—and diseases and conditions that affect them. Examples : "My dentist recommended I see a specialist in periodontics because my gums were bleeding. " 치과 의사는 잇몸에서 피가 나서 치주학 전문의를 만나보라고 권했습니다. medicine anatomy body disease AI와 채팅어휘 게임독해 연습