It's bad for your health. Saliva is also called saliva. Traditional Chinese medicine calls saliva secreted by human body "body fluid", which belongs to yang, that is, the main surface. There is a saying in Chinese medicine that "body fluid and blood are homologous", which means that body fluid and blood are derived from the essence of diet and can reproduce and interact with each other. Excessive loss of body fluid will cause deficiency of both qi and blood; Deficiency of qi and blood can also make body fluid insufficient. The increase or decrease of body fluid can directly affect the balance of yin and yang in the body, thus leading to the loss of qi and blood and diseases.