What protects the oral cavity from acidic food?

Bicarbonate in saliva plays a critical role in protecting the oral cavity from acidic foods. When acidic food enters the mouth, bicarbonate acts as a buffering agent, neutralizing the acid and helping to maintain a balanced pH in the oral cavity. This buffering action is vital for preventing potential damage to the tissues in the mouth and throat, as well as protecting the enamel of the teeth from acidic erosion.

Salivary amylase, lingual lipase, and mucin serve different functions in the oral cavity. Salivary amylase initiates the breakdown of carbohydrates, while lingual lipase is responsible for the digestion of fats. Mucin contributes to the viscosity of saliva, aiding in the lubrication and formation of the food bolus, but none of these functions involve buffering acidity. Therefore, bicarbonate stands out as the primary substance that directly safeguards the oral cavity against the effects of acidic foods.