When is there a constant flow of saliva that protects the teeth, tongue, and mucous membranes?

When is there a constant flow of saliva that protects the teeth, tongue, and mucous membranes?

• A. At rest
• B. During meals
• C. During sleep
• D. When dehydrated

Answer: (A)

Saliva provides continuous protection by keeping the surfaces of the teeth, tongue, and mucosa moist, buffering acids, and aiding remineralization. Even without eating, the salivary glands maintain a baseline, constant flow at rest, so these protective effects are ongoing. During meals, stimulation increases saliva production, which is helpful but not a constant rate. Sleep markedly reduces flow, and dehydration lowers it as well, both of which diminish protection. Therefore, the steady, ongoing protection comes from saliva flow at rest.

Saliva provides continuous protection by keeping the surfaces of the teeth, tongue, and mucosa moist, buffering acids, and aiding remineralization. Even without eating, the salivary glands maintain a baseline, constant flow at rest, so these protective effects are ongoing. During meals, stimulation increases saliva production, which is helpful but not a constant rate. Sleep markedly reduces flow, and dehydration lowers it as well, both of which diminish protection. Therefore, the steady, ongoing protection comes from saliva flow at rest.