What happened when we are eating chewing gum?

Chewing sugarless gum after a meal can increase salivary flow by stimulating both mechanical and taste receptors in the mouth. The average unstimulated salivary flow rate for healthy people is 0.3-0.4 mL/min.11 The physical act of chewing stimulates salivary flow: simply chewing unsweetened, unflavored chewing gum base stimulates the salivary flow rate by 10-12 times that of the unstimulated rate.12 Flavors also act as salivary stimulants.11 The stimulated salivary flow rate is significantly greater while chewing sweetened and flavored gum as opposed to unsweetened, unflavored chewing gum base.12, 13 Increasing saliva volume helps to dilute and neutralize acids produced by the bacteria in plaque on teeth. Over time, these acids can damage tooth enamel, potentially resulting in decay.