The present invention relates to an interdental brush includes: a handle； a nozzle disposed in the handle； and a brush having filaments provided on a wire wherein a rear anchor is inserted in the nozzle. The nozzle includes a tapered portion and a straight portion. The nozzle is flexible along with the movement of the brush. The tapered portion is tapered toward the tip, and wherein a lateral face of the tapered portion is concavely curved between the tip and the rear anchor. The straight portion is provided on the extended tapered portion and across-section of the straight portion towards the extended straight portion is substantially the same. The present invention provides an interdental brush having a wire which is sufficiently high in durability, and bends resistance even if the number of wire usages increased.本發明之齒間刷係有關於一種下述齒間刷，前述齒間刷具備握把體、突設於前述握把體之噴嘴體、及於基端被插入至前述噴嘴體之線設有絲之刷體；前述噴嘴體具有錐部及直線部，前述噴嘴體可隨著前述刷體之動作撓曲，前述錐部往其前端逐漸變細，並且，前述錐部之側面從前述前端至基端形成凹狀曲面，前述直線部係於前述錐部之前端延伸設置，直交於延伸設置方向之截面之形狀在延伸設置方向約略相同。根據本發明，可提供線之耐久性夠高，即使使用次數增多，線亦不易折彎之齒間刷。
