In caries development, which pair is implicated as primary drivers?

• A. Sugars
• B. Oral flora; dietary carbohydrates (sugars)
• C. Saliva pH; fluoride
• D. Genetics; calcium intake

Answer: (B)

Caries progress when acid is produced by plaque bacteria as they metabolize fermentable carbohydrates from the diet. The two main drivers are the oral flora—the acid-producing bacteria in dental plaque—and dietary carbohydrates (especially sugars) that fuel their fermentation. Repeated sugar exposure pushes the biofilm toward an acidurized state, lowering pH and causing mineral loss from enamel. Saliva pH and fluoride act more as modifiers—saliva buffers and washes away acids, while fluoride promotes remineralization and inhibits demineralization. Genetics or calcium intake influence risk more indirectly. So the best pairing is the oral flora together with dietary sugars.