PROBLEM TO BE SOLVED: To provide a foamable solid preparation for oral cavity cleaning that effectively removes fur on the tongue as a main cause of physiological foul breath and produces immediate effects.SOLUTION: The foamable solid preparation for oral cavity cleaning comprises an insoluble vegetable fiber and a foamable component and causes these components to act on the tongue thereby causing fine projections formed on the surface of the preparation to physically separate fur on the tongue as a main cause of physiological foul breath from the tongue and causing the foaming effects of the foamable component to effectively recover and remove the separated fur on the tongue. Thus, the foamable solid preparation for oral cavity cleaning exhibits remarkably high fur-removing effects and produces immediate and long-term persistent foul breath-removing effects.