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By thoroughly cleaning this area before brushing the rest of the tooth' s surfaces, you can wipe out most of the problem- causing bacteria in your mouth. 在刷牙齒其余表面之前徹底清潔這塊區(qū)域， 你可 以消滅口腔中大部分會導(dǎo)致問題的細(xì)菌。