Patent ID: 8522389

Claim:
A method of forming toothbrush bristles, the method comprising: preparing bundles of the toothbrush bristles by mixing a polyester resin and a PTT resin in a ratio of 90˜40 to 10˜60; cutting the bundles of the toothbrush bristles; layering a pair of cut bundles of the toothbrush bristles of the cut bundles; sealing the layered pair of cut bundles with tape; preliminarily immersing the sealed bundles into a liquid not having the ability to dissolve the bristles; and tapering one side of the toothbrush bristles solely by entirely immersing the prepared bundles of toothbrush bristles into a chemical such that 80% or more of the toothbrush bristles have a length of taper of 4.0 millimeters or less, the length of taper having a smooth exterior surface, said tape having holes therein so as to allow the chemical to infiltrate into the layered pair so as to dissolve sharp edges of the cut bundles.