Its main functions are digestion, taste and cleaning, and it has a certain immune protection effect on the local area, but it has no obvious bactericidal effect. Therefore, saliva is a physiological substance secreted by the human body itself.
It contains carbonate, phosphate and protein, which can bring chemical protection to teeth; Amylase contained in it can help digestion; The ingredients can fight bacteria; Can clean the mouth; Cancer and AIDS can be detected by detecting saliva.
Extended data:
Saliva has eight functions for human health:
First, hemostasis: saliva can promote blood coagulation, and saliva can help stop bleeding when oral trauma or tooth extraction causes bleeding.
Second, lubrication: saliva contains mucin, which makes the mouth smooth and soft.
Third, washing function: it can wash away food residues and keep the mouth clean and hygienic.
Dilution: When acid, bitter taste and other irritating things enter the mouth, saliva secretion increases and is diluted, which is convenient for spitting or swallowing.
References:
Baidu encyclopedia-saliva