How long do oral acids persist after sugar ingestion?

How long do oral acids persist after sugar ingestion?

• A. 5-10 minutes
• B. 20-40 minutes
• C. 60-90 minutes
• D. 2-3 hours

Answer: (B)

After fermentable carbohydrates are consumed, plaque bacteria rapidly produce acids and the pH in the mouth drops below the level at which enamel starts to demineralize. Saliva then works to buffer and clear these acids, and in a person with normal saliva flow and good oral hygiene, this acidic period generally lasts about 20–40 minutes. That window reflects the time needed for buffering and remineralization to restore the environment. Shorter durations, like 5–10 minutes, miss the full acid exposure, while much longer durations (60–90 minutes or 2–3 hours) would suggest a persistently acidic mouth, which isn’t typical under normal conditions. This 20–40 minute window is the key period dentists watch for caries risk and for timing preventive measures like fluoride use.

After fermentable carbohydrates are consumed, plaque bacteria rapidly produce acids and the pH in the mouth drops below the level at which enamel starts to demineralize. Saliva then works to buffer and clear these acids, and in a person with normal saliva flow and good oral hygiene, this acidic period generally lasts about 20–40 minutes. That window reflects the time needed for buffering and remineralization to restore the environment. Shorter durations, like 5–10 minutes, miss the full acid exposure, while much longer durations (60–90 minutes or 2–3 hours) would suggest a persistently acidic mouth, which isn’t typical under normal conditions. This 20–40 minute window is the key period dentists watch for caries risk and for timing preventive measures like fluoride use.