<P> Saliva is a watery substance formed in the mouths of animals , secreted by the salivary glands . Human saliva comprises 98 % water , plus electrolytes , mucus , white blood cells , epithelial cells ( from which DNA can be extracted ) , glycoproteins , enzymes ( such as amylase and lipase ) , antimicrobial agents such as secretory IgA and lysozyme . The enzymes found in saliva are essential in beginning the process of digestion of dietary starches and fats . These enzymes also play a role in breaking down food particles entrapped within dental crevices , thus protecting teeth from bacterial decay . Furthermore , saliva serves a lubricative function , wetting food and permitting the initiation of swallowing , and protecting the mucosal surfaces of the oral cavity from desiccation . </P>
<P> Saliva is a watery substance formed in the mouths of animals , secreted by the salivary glands . Human saliva comprises 98 % water , plus electrolytes , mucus , white blood cells , epithelial cells ( from which DNA can be extracted ) , glycoproteins , enzymes ( such as amylase and lipase ) , antimicrobial agents such as secretory IgA and lysozyme . The enzymes found in saliva are essential in beginning the process of digestion of dietary starches and fats . These enzymes also play a role in breaking down food particles entrapped within dental crevices , thus protecting teeth from bacterial decay . Furthermore , saliva serves a lubricative function , wetting food and permitting the initiation of swallowing , and protecting the mucosal surfaces of the oral cavity from desiccation . </P>
where does saliva come from in the mouth
where does saliva come from in the mouth
the salivary glands
the salivary glands