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This study was carried out to assess the necessity and importance of plaque control, and investigated and compared the effect of plaque removal with the different types of toothbrushes and by different methods.Ten adults, age 24 to 27 years, 6 males and 4 females, with clinically healthy periodontal tissue,were selected for the purpose of this study. They brushed by the scrubbing and rolling method using 14 kinds of toothbrushes which differed according to the forms of the bristle. Plaque scores were measured using the Plaque Control Record (O' Leary et al., 1972.) before and after toothbrushing.The results were as follows:The plaque removal rate for all teeth averaged 65.6%. The incisor plaque removal rate averaged 84.0%. The molar plaque removal rate averaged 54.1%. The region with the highest plaque removal rate was the buccal surface of the incisors ( plaque removal rate : 62.5-100%) , and the region with the lowest rate was the proximal surface of the molars (plaque removal rate : 10.8-61.7%) .The plaque removal rates tended to be lower for the molars than the incisors and on the proximal surfaces than the lingual, occlusal or buccal surfaces. Differences in plaque removal rates according to brush and toothbrushing methods were also noted.The results suggested that the importance of the choice of appropriate toothbrushes and toothbrushing methods on an individual basis and the necessity of the systematic toothbrushing instruction in increasing the plaque removing effect.

Japanese green tea has been known to have an anticarious action and a halitosis-preventing action.