Normal saliva is a clear texture that serves to flush out the mouth, and long-term salivary mucus may cause diseases such as submandibular gland stones and dental caries. 1. Stones in the submandibular gland. Long-term salivary mucus and high inorganic salt content inside the saliva make the submandibular gland susceptible to ductal calculi, causing inflammation of the submandibular gland. Due to the ducts themselves from the bottom upward travel, coupled with saliva viscous inorganic salts deposited in the ducts, can not be flushed in a timely manner will form duct stones. 2. Dental caries. Normal saliva plays a role in flushing food debris in the mouth, clean teeth, when saliva viscous, the surface of the teeth of the soft scale accumulation increased, under the action of bacteria, the risk of dental caries greatly increased. Long-term sticky saliva may be due to abnormal secretion of salivary glands, it is recommended to go to the hospital in time for examination and treatment.