しこうTop 20000MeaningsNoun1. (dental) plaqueOther spellings歯し垢こうUsage share unknownKanji in other spellings歯tooth垢filthPitch accentしこうExamples2歯し垢こうがずいぶん付ついていると思おもいますが。I think I have a lot of plaque build up.歯し垢こうをとらなければなりません。The plaque has to be removed.