PROVIDED IS A DENTIFRICE COMPOSITION CAPABLE OF SUFFICIENTLY MANIFESTING, AFTER LONG-TERM STORAGE, BACTERICIDAL EFFECTS AGAINST A PERIODONTOPATHIC BIOFILM FORMED BY PERIODONTAL PATHOGENIC BACTERIA IN THE ORAL CAVITY, AND SUPPRESSION OF TOOTH SURFACE ADHESION BY BACTERIA IN THE ORAL CAVITY, AND ALSO CAPABLE OF EFFECTIVELY SUPPRESSING PERIODONTOPATHIC BIOFILM GENERATION. THE DENTIFRICE COMPOSITION IS CHARACTERIZED BY CONTAINING: (A) A PROPYLENE GLYCOL ALGINATE； (B) AN ISOPROPYL METHYL PHENOL； AND (C) AT LEAST ONE KIND OF NON-IONIC SURFACTANT SELECTED FROM A POLYOXYETHYLENE ALKYL ETHER, WITH A C14-C18 ALKYL GROUP AND AN AVERAGE NUMBER OF MOLES OF ETHYLENE OXIDE ADDED OF 2 TO LESS THAN 20, AND A POLYOXYETHYLENE HYDROGENATED CASTOR OIL WITH AN AVERAGE NUMBER OF MOLES OF ETHYLENE OXIDE ADDED OF 5-30.
