A oral care composition includes: (a) a guanidine active; (b) a film-forming polymer; (c) a hydrophobic viscosity modifier in an amount sufficient to provide the oral care composition with a particle settling time greater than 20 minutes; and (d) an oil carrier. The guanidine active is preferably L-arginine. The film-forming polymer is preferably GANTREZ. The hydrophobic viscosity modifier is preferably a gelled mineral oil. The oil carrier is preferably a vegetable oil. A method of cleaning teeth includes applying to the teeth the oral care composition such that the oral care composition cleans the teeth. A oral care implement includes: a handle; a head mounted to the handle, the head having an outer surface and a plurality of tooth cleaning elements extending outwardly from the outer surface; and a gelatin capsule containing the oral care composition positioned on the head.