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唾液是口腔内唾液腺体所分泌的一种混合物,为一种无色、无味的近于中性(PH6.6～7.1)的泡沫状液体,是人体生命活动不可缺少的重要物质,有“生命之泉”的美誉。人的口腔是由腮腺、颌下腺、舌下腺三对大的唾液腺及无数小的唾液腺组成。由这些大小唾液腺所分泌的混合液,通称为唾液。成人每天分泌的唾液量约为1000～1500毫升。唾液的实际分泌量要受气候、年龄、情绪、食物的味道等因素的影响。
Saliva is a mixture secreted by salivary glands in the oral cavity. It is a colorless, odorless, nearly neutral (pH6.6 ~ 7.1) foamy liquid and is an indispensable and important substance in human life. Spring of life "reputation. Human oral cavity is composed of parotid gland, submandibular gland, sublingual gland three pairs of large salivary glands and numerous small salivary glands. The mixture secreted by salivary glands of these sizes, commonly known as saliva. Saliva secretion per day for adults is about 1000 ~ 1500 ml. The actual amount of saliva to be affected by climate, age, mood, food flavor and other factors.