Filament having unique tip and surface characteristics

An oral-care implement including at least one cleaning element, wherein the at least one cleaning element comprises a composite filament comprising

• an elongated flexible body having a length, a longitudinal axis, and a longitudinal outer surface comprising an external material, the elongated flexible body having at least one free end thereof with a tip having a tip surface comprising the external material;
• wherein the tip surface has therein a plurality of craters disposed thereon, each of the craters having a surface edge of a predetermined size and shape, a bottom comprising at least a first internal material and situated at a first depth from the surface edge, and a wall comprising the external material and extending longitudinally from the surface edge to the bottom, wherein the external material differs from the at least first internal material in at least one physical property selected from the group consisting of color, elasticity, density, hardness, surface energy, heat-shrinkage rate, longitudinal anisotropic-shrinkage rate, isotropic-shrinkage rate, bending-shrinkage rate, and any combination thereof.