The ancients attached great importance to saliva health care. Since ancient times, health experts have regarded saliva as an important source of health, so they deified and alienated saliva and endowed it with the reputation of "golden jade liquid" and "Qiongjiang Yuquan". The ancient man-made word "live" also comes from the water beside the tongue, which not only shows that people can live with the water beside the tongue, but also shows that saliva can live with people, which also emphasizes the importance of saliva.