The present invention relates to an interdental brush having a stop for maintaining the positioning capability of a cleaning brush and a manufacturing process thereof. During the first injection molding, a first handle grip and a stop are formed. The first handle grip is in the shape of the letter L and a receiving space is disposed therein. The stop is located at a bend adjacent to the first handle grip, and the inner side of the stop and the corresponding inner side of the first handle grip are separated by a gap. Then, a cleaning brush is embeddedly inserted into one end of the first handle grip and a cleaning rod of the cleaning brush is bent so that the cleaning rod is also in the shape of the letter L. At this time, the front end of the cleaning rod and the bristles thereon are exposed from the first handle grip, and the other end of the cleaning rod is embedded in the gap as described above. Finally, a second injection molding is performed to form a second handle grip on the first handle grip to cover the cleaning rod and the stop so as to form the interdental brush.本發明係一種具擋塊以保持清潔刷定位能力之牙間刷及其製程,其中,在第一次射出成形時,形成一第一握柄及一擋塊,該第一握柄呈L狀,其內設有一容納空間,該擋塊則位在鄰近該第一握柄的彎折處,且其內側面與該第一握柄相對應之內側面相隔一間距,嗣,將一清潔刷嵌插至該第一握柄之一端,且彎折該清潔刷之一清潔桿,令該清潔桿能呈L狀,此時,該清潔桿之前端及其上的刷毛會外露於該第一握柄外,該清潔桿之另一端則嵌卡至前述間距中,最後,進行第二次射出成形,以在該第一握柄上形成一第二握柄,且包覆該清潔桿與擋塊,以形成該牙間刷。1‧‧‧牙間刷11‧‧‧第一握柄11A‧‧‧組裝部11B‧‧‧第一握持部110‧‧‧容納空間111‧‧‧開口115‧‧‧凹穴117‧‧‧凸柱12‧‧‧擋塊13‧‧‧清潔刷131‧‧‧清潔桿131A‧‧‧第一桿部131B‧‧‧第二桿部133‧‧‧刷毛
