Changes in plaque pH were examined following ingestion of tablets composed of sorbitol (S) or xylitol (X) combined with various levels of dextrose (D), fructose (F), or sucrose (U). Pure S and X tablets caused a slight pH rise. The 3:1 ratios of S :D, S :F, X:D, and X:F caused slight lowerings to plaque pH means of 6.3, 6.8, 6.7, and 6.7, respectively, while 3:1 S: U caused the pH to drop to 5.6. All the 1 :1, 1:3 and 0:1 ratios caused large drops in plaque pH.
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