The effects of chewing sorbitol-containing gum and paraffin upon human interproximal plaque pH responses after consumption of a jelly donut were investigated in this study. Prolonged plaque pH responses were observed following consumption of the jelly donut. Dramatic rises in pH resulted when sorbitol gum and paraffin were chewed 15 min after consumption of the donut. Ten minutes of chewing resulted in significantly higher (p < 0.01) pH values than 5 min of chewing.
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M.E. Jensen (2009) studied this question.