Abstract: Flexible pen nib (20) for writing instruments includes a rod-like nib body having inner capillary channels (24) for passing ink therethrough. This nib body is a porous rubber-like elastic body having composite-fiber textures obtained by combining a number of longitudinally oriented crimped polyamide fibers (21), with synthetic resin elastomer (22). Those composite-fiber textures form, within the cross-section of the pen nib, random-shaped elements (23) which are arranged in a uniformly random aggregation leaving the capillary channels (24). The capillary channels (24) have an orientation in the axial direction of the pen nib, and provide the pen nib with a predetermined porosity.

Abstract: An implement for removing dental plaque and massaging gums in a form of a slender rod-like body of appropriate length comprising a fibrous structure obtained by bundling or bundling and bonding a plurality of fibers such as synthetic fibers in a longitudinal direction and a shell layer on the outer peripheral section of the fibrous structure, the shell layer is partly cut or ground to expose the fibrous layer in the interior thereof to form a brushing section, the fibrous layer may contain such as hygienically harmless alkali substances, surfactant, bactericide, deodorant, perfumes or the like.

Abstract: Dental root canal-treating appliance usable for cleaning pulp cavity and/or for application of medicine in the treatment of the root canal, the appliance being in the form of a slender rod of the diameter larger than 0.3 mm and of the length about 30 mm with appropriate numbers of continuous slits or conduits for absorption of liquid and/or blood in the canal and/or for retention of the medicine, at least one end of the rod, over the length less than about 2 mm from the tip, a thinner end section of the diameter about 0.25 mm being formed so that a shoulder is formed, the shoulder acts as an engagement-edge or stop-edge against the bottom of the canal and apical foramen in the diseased teeth.