Which factor is NOT listed as a determinant of whether oral flora are aciduric or non-aciduric?

• A. Vitamin C intake
• B. Number of organisms, ratio
• C. Virulence (ability to cause disease)
• D. Saliva (flow, enzymes, minerals, immunity)

Answer: (A)

The property of being aciduric versus non-aciduric in oral flora is shaped by the environment and the microbial community, not by a single vitamin factor. The amount and balance of bacteria matters: when the community has more aciduric organisms or a higher ratio of aciduric to non-aciduric strains, the plaque is better at surviving and continuing to produce or tolerate acid after sugar intake, which lowers and sustains a acidic environment. Saliva plays a crucial role, too—its flow and components buffer acids, supply minerals for remineralization, and support immune factors, all of which influence which bacteria can persist in the biofilm. Virulence relates to the potential harm or disease-causing ability of bacteria, which can be linked to traits like acid production, but it does not directly set whether a species is aciduric. Vitamin C intake, while important for tissue health and antioxidant defense, does not determine the acid tolerance of oral flora.