Restorative & Materials · single question
A patient who consumed an energy drink: what is the most likely oral pH?
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Correct answer: D. 5
Energy drinks are highly acidic — their pH typically ranges from 2.9 to 3.8 (highly acidic). After consumption, the oral pH drops significantly below the critical pH of 5.5 (the threshold for enamel dissolution). The oral pH immediately after consuming an energy drink would be in the range of 4-5 or lower. Among the options given (5, 6.5, 8), pH 5 is the most accurate and clinically relevant answer — it is below the critical pH of 5.5 and consistent with energy drink-induced oral acidification.
- A. CORRECT. Energy drinks have a pH of approximately 2.9-3.8. After consumption, oral pH drops well below 5.5 (critical pH). Among options given, pH 5 is the most acidic and appropriate answer.
- B. Incorrect. pH 6.5 is close to normal resting salivary pH (6.7–7.4) — it is not consistent with energy drink consumption, which dramatically lowers oral pH.
- C. Incorrect. pH 8 is alkaline — this does not occur after consuming acidic energy drinks.
- D. Not a valid option as stated in the source.
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