Schedule 1 [O2-3] What Causes Xerostomia and Impairs Oral Health-related QoL?-A Study on the Quantity and Quality of Saliva- *Mizuki Takahashi1, Taro Mukaibo1, Junpei Kubota2, Yoko Tada2, Karaki Junichi2, Takashi Munemasa1, Tomotaka Nodai1, Yusuke Kondo1, Chihiro Masaki1, Ryuji Hosokawa1 (1. Division of Oral Reconstruction and Rehabilitation, Kyushu Dental University, 2. Division of Geriatric and Disables Dentistry, Kyushu Dental University)