When gingival recession has been observed, it is diffecult to clean the approximate surfaces only using toothbrush. The purpose of this study is to observe which interdental cleaner is effective on the approximate surface. Three types of interdental cleaner have been studied. They were “Interdental brush (Denticator co.)”, “Rubber tip (Denticator co.)” and “Wooden stimulator (Navec International pty co.)”. Between the cleaning effect of interdental brush and that of rubber tip, significant difference (p<0.05) has been observed. Between the effect of interdental brush and that of wooden stimulator, there has not been difference statistically, but interdental brush has been seen more effective. Between the effect of wooden stimulator and that of rubber tip, significant difference has not been observed. It has been concluded that interdental brush will be effective for the interdental cleaning in the cases of gingival recession.