The mouth constantly produces clear water, which is a sign of salivation. There are three major salivary glands in the mouth: the sublingual, submandibular and parotid glands. All three glands are capable of secreting saliva, and there are also smaller glands of varying sizes, such as the palatine glands and the lacrimal glands, which exist to keep the mouth in a moist environment. Saliva is essential to help chew and digest food, and it also has antiseptic properties. If you often think about some food or more hungry, this time the secretion of saliva will be more, there are some people because the salivary glands in the mouth is more developed, saliva is secreted more vigorously.