What is the primary impact on the oral microbial community when there is a decrease in salivary flow rate?

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Marked rise in the total count of oral bacteriaTransition towards a microflora that produces more acidNotable reduction in the overall number of oral bacteriaChange favoring a predominance of aerobic microorganismsIncrease in salivary enzyme activity

Explanation

A decrease in salivary flow primarily causes a shift in the oral microflora towards species that generate more acid (acidogenic microflora). This change can increase the risk of dental caries, as acidogenic bacteria thrive in low saliva conditions. While bacterial numbers may fluctuate, the key effect is the altered composition favoring acid-producing microbes.