Patent ID: 8256848

Claim:
A method for making an interdental brush sequentially comprising preparing a handle and a bristle stem with a plurality of bristles twisted thereon; wherein, said handle having a handle body, a plurality of fixing slots defined on said handle body at intervals and communicated with the exterior, a through hole positioned on said handle body and intercommunicated with said fixing slot, and a fixing hole placed on said handle body and set correspondently to said through hole; inserting said bristle stem being into said through hole and fixed in said fixing hole for a combination, allowing an exposure of said bristle out of said handle; fixing said bristle stem in said handle body by preparing a punching device to punch said bristle stem with a portion thereof that is exposed to said fixing slots, thence allowing a plurality of expanding portions to be correspondingly formed on said bristle stem; wherein, said expanding portions having an outermost diameter lager than an opening of said through hole, permitting said bristle stem to be firmly engaged and embedded in said fixing slot; and forming an integral interdental brush by applying an injection molding machine to form a filler, which appropriately wraps said fixing slots up for fixedly enveloping said bristle stem and said expanding portions.