When normal, healthy, mouth bacteria are starved of Oxygen they are forced into anaerobic mode. In anaerobic mode they make lactic acid, amongst other nasties. The acid causes tooth decay and gum inflamation. Not good. When Oxygen is available bacteria will always use it because aerobic respiration is fifteen times as effective as anaerobic respiration. In aerobic mode no acid is produced, so no decay, no gum inflammation. Good.
So?
Plaque is fantastically effective at sealing out Oxygen.
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