Australian Dental Council (ADC) Practice Test

The most important role of saliva in preventing dental caries is its buffering action. Saliva plays a crucial part in regulating the pH level in the oral cavity. When acidic byproducts are produced as a result of carbohydrate fermentation by bacteria, the saliva helps neutralize these acids, which is vital in preventing the demineralization of tooth enamel. By maintaining a balanced pH, saliva reduces the risk of enamel erosion, thus lowering the likelihood of caries development.

While the antimicrobial properties of saliva and its ability to provide minerals for remineralization are also essential functions that contribute to oral health, they are secondary to the immediate protective role of buffering against acid attacks. The facilitation of digestion, while an important function of saliva, does not directly relate to the prevention of caries. Understanding the buffering action emphasizes the critical role saliva plays in maintaining oral health and preventing conditions like dental caries.