How do saliva flow and buffering capacity affect plaque acid neutralization?

How do saliva flow and buffering capacity affect plaque acid neutralization?

• A. Higher flow slows neutralization
• B. Reduced flow accelerates neutralization
• C. Higher saliva flow and buffering neutralize acids faster, reducing caries risk
• D. Saliva flow has no effect

Answer: (C)

Saliva flow and its buffering capacity determine how quickly acids produced by plaque are neutralized. When bacteria ferment sugars, they create acids that lower the local pH. Saliva helps in two ways: it dilutes and washes away these acids (flow), and it provides buffering ions like bicarbonate and phosphate that resist pH drops (buffering capacity). When flow is high, acids are cleared faster and more buffering ions are available, so the pH returns toward neutral more quickly. This rapid recovery reduces the duration of enamel demineralization, which lowers caries risk. Conversely, low flow means acids linger longer and buffering is less effective, increasing risk. That’s why higher saliva flow and buffering capacity speed up neutralization and decrease caries risk.

Saliva flow and its buffering capacity determine how quickly acids produced by plaque are neutralized. When bacteria ferment sugars, they create acids that lower the local pH. Saliva helps in two ways: it dilutes and washes away these acids (flow), and it provides buffering ions like bicarbonate and phosphate that resist pH drops (buffering capacity). When flow is high, acids are cleared faster and more buffering ions are available, so the pH returns toward neutral more quickly. This rapid recovery reduces the duration of enamel demineralization, which lowers caries risk. Conversely, low flow means acids linger longer and buffering is less effective, increasing risk. That’s why higher saliva flow and buffering capacity speed up neutralization and decrease caries risk.