Saliva secreted from the salivary glands plays an important role in the process of digesting food in humans. The case of too little saliva secretion or too much saliva secretion is also a matter worth paying attention to, because the body may be experiencing something abnormal.

In humans, salivary glands are exocrine glands whose main role is to produce saliva or secrete amylase. There are many salivary glands scattered throughout the oral mucosa, of which the three main pairs are the parotid salivary glands, submandibular salivary glands and sublingual salivary glands.