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The purpose of this study is to investigate the effect of tooth cleaning by drinking green tea. To figure out the decrease degree of debris scores by drinking green tea after having snacks, this experiment was conducted with 71 female college students who are in their 20's as subjects. The debris scores were measured 5 minutes after having snacks.(This snack is a loaf of bread which name is Soboru). Each debris scores was obtained by measuring debris scores without eating anything after having snacks, of drinking coffee after eating snacks and of drinking green tea after having snacks. 1. The debris score of 5 minutes after having snacks without eating anything was 27.65±8.03, the score of drinking coffee for 5 minutes after having snacks was 26.77±8.70 and the score of drinking green tea for 5 minutes after having snacks was 23.44±8.32. 2. The debris score of drinking green tea after having snacks was significantly lower than coffee or no drinks (p<0.05). 3. The decrease rate of the debris score after drinking coffee was 3.2% and the one after drinking green tea was 15.2%. 4. The decrease rate was higher on upper arch than lower arch and on posterior region than anterior region. Drinking green tea after having snacks has a significant effect to decrease debris scores (p<0.05). Green tea has an effect of tooth cleaning so it can be considered that drinking green tea is counterproposal of mechanical tooth cleaning action under the circumstance with restriction on oral hygiene work. Accordingly drinking green tea after having snacks is one of the recommended ways to promote oral health through diet.