Saliva or spit has negative connotations: it may be use to insult or express disgust against somebody, or it may be associated with dirtiness, uncleanness, impurity, etc. But as it is, it has its beauty and usefulness. Most animals posses salivary gland for the purpose only nature and evolution can tell. Snakes use their venomous saliva to kill a prey and some birds utilize their saliva as glue to build their nests. Human saliva plays a vital role in digestion. These and other uses of saliva let us see the extraordinary other side of this trivial thing.
(1) It initiates digestion. Saliva contains enzymes that even break down chewed food at the molecular level. It also facilitates chewing; imagine a dry mouth-it would be very hard to chew and swallow the food. It also helps the tongue to taste.
(2) It protects the whole mouth. Saliva enzymes prevent bacteria from … Read More