Which function is a specific role of saliva in buffering acidity?

• A. Antibacterial
• B. Buffering
• C. Mineralization
• D. Digestion

Answer: (B)

Saliva protects teeth by neutralizing acids, which is its buffering action. When sugars are fermented by plaque bacteria, acids build up and lower the mouth’s pH. Saliva supplies buffering agents, mainly bicarbonate ions, that neutralize these acids and push the pH back toward neutral. This buffering helps prevent enamel demineralization and supports remineralization by keeping the mineral balance favorable. Other saliva roles include antibacterial protection and supplying minerals for remineralization, and it also begins digestion with enzymes, but the specific function that directly counters acidity is buffering.