Why is bedtime brushing considered the most critical time to brush?

Why is bedtime brushing considered the most critical time to brush?

• A. Decreased salivary flow at night
• B. Increased salivary flow at night
• C. Saliva neutralizes all acids during the night
• D. Brushing at night is not necessary

Answer: (A)

When you brush at bedtime, you’re addressing a period when saliva production drops sharply. Saliva normally helps sweep away food particles, buffers acids produced by plaque bacteria, and supplies minerals that aid remineralization. At night, this natural cleansing and buffering slows down, so acids from carbohydrate fermentation can linger on tooth surfaces longer and drive demineralization. Brushing before sleep removes the plaque and food debris that feed acid production and also delivers fluoride to help protect enamel during the long overnight interval. The other statements don’t fit: salivary flow decreases rather than increases at night; saliva doesn’t neutralize all acids during the night; and brushing at night is indeed necessary for protection.

When you brush at bedtime, you’re addressing a period when saliva production drops sharply. Saliva normally helps sweep away food particles, buffers acids produced by plaque bacteria, and supplies minerals that aid remineralization. At night, this natural cleansing and buffering slows down, so acids from carbohydrate fermentation can linger on tooth surfaces longer and drive demineralization. Brushing before sleep removes the plaque and food debris that feed acid production and also delivers fluoride to help protect enamel during the long overnight interval. The other statements don’t fit: salivary flow decreases rather than increases at night; saliva doesn’t neutralize all acids during the night; and brushing at night is indeed necessary for protection.