This study was aimed at exploring why momentary treatments of dental plaque or salivery sediment with sugar solutions will bring about an increase in glycolysis that may persist for 2-6 hours, when glycolysis is measured through depression of the pH level. Tests on carbohydrate of salivary sediment were performed by the anthrone method before and after treatment with sucrose solutions Alcohol-insoluble carbohydrate formed in sediment on treatment with sucrose at room temperature, and 37[degree] C, but not at 4[degree] C. Each of 13 samples of dental plaque obtained from the teeth of subjects who had refrained from toothbrushing was found to contain alcohol-insoluble carbohydrate. These findings indicate the possibility of polymer formation from sucrose solutions.