the present invention provides a method of manufacturing a toothbrush having needle - shaped bristles , and a toothbrush manufactured by the method . the toothbrush manufacturing method of the present invention includes the step of partially tapering ends of bristles , which are made of polyester and are set in a toothbrush body , through a physical grinding process , and the step of completing of a process of tapering the partially tapered bristles by immersing the partially tapered bristles in a chemical . the present invention makes it possible for toothbrush bristles to be tapered through a simple process . furthermore , the present invention solves conventional difficulties occurring in tapering bristles after setting them in toothbrush bodies .