Australian Dental Council (ADC) Practice Test 2026 - Free ADC Practice Questions and Study Guide

The recommendation to reduce sugar in the diet is grounded in the understanding of how lactobacilli contribute to dental caries. Lactobacillus species are known to thrive in acidic environments, which are often the result of sugar fermentation. High levels of lactobacilli indicate an increased risk of caries, as these bacteria metabolize sugars and produce acids that can demineralize tooth structure.

By reducing sugar intake, the environment that supports the growth of these bacteria is diminished. This dietary adjustment can significantly lower the acid production from lactobacilli, ultimately helping to reduce the risk of cavities and improve overall oral health. Furthermore, less sugar in the diet limits the substrate available for these bacteria, potentially leading to a decrease in their count over time.

Other approaches, while beneficial in certain contexts, do not directly address the underlying issue of high lactobacilli counts related to dietary sugars. For example, increasing oral hygiene practices, using antibacterial mouthwash, or increasing fluoride use can be supportive measures but may not be as effective as directly addressing the dietary factors that contribute to the growth of lactobacilli and their related pathogenic effects.