Question 140 · LDEK · Etiology and pathogenesis of caries
How long does the dental plaque remain acid until it returns to its normal pH value 7?
- A. for 5-10 minutes.
- B. for 10-15 minutes.
- C. for 15-30 minutes.
- D. for 30-60 minutes.
- E. longer than 60 minutes.
Hint
Recall the Stephan curve: a rapid drop after sugar intake, followed by a much slower recovery buffered by saliva.
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