Many sugars added to carbohydrate foods cause dental caries. Which one of the following sugars is not associated with dental caries?

Lactose is the sugar that is not typically associated with the same level of risk for dental caries as other sugars like dextrose, glucose, and sucrose. This is primarily because lactose, which is found in milk and dairy products, does not contribute to dental caries in the same way that fermentable sugars do.

The bacteria in the mouth that are responsible for tooth decay thrive primarily on sugars that can be easily fermented. Dextrose, glucose, and sucrose are easily fermented by these bacteria, leading to acid production which can erode tooth enamel and result in cavities. Lactose, on the other hand, is less fermentable by certain caries-related bacteria, which means it is less likely to lead to the same quick acid production and tooth decay. Additionally, the presence of calcium and other beneficial nutrients in dairy products containing lactose can further help protect against dental caries, enhancing oral health.

This understanding highlights the significance of differentiating sugar types and their various impacts on dental health, particularly in preventative dentistry practices.