Which of the following is NOT a function of saliva?

Saliva plays several important roles in oral health and digestion, including beginning the digestive process, aiding in speech, and lubricating food for swallowing.

The assertion that saliva promotes the growth of harmful bacteria is inaccurate. In fact, saliva contains antimicrobial properties and enzymes that help control the population of bacteria in the mouth. It contains components such as lysozyme, lactoferrin, and immunoglobulins, all of which contribute to maintaining a healthy balance of oral flora by inhibiting harmful bacteria.

Therefore, understanding the protective and functional roles of saliva reinforces why promoting the growth of harmful bacteria does not fit the established functions of saliva.