An interdental brush handle comprising: a handle having an upper brushing portion disposed on an upper portion thereof, the upper brush portion being provided with one of the laterally-perforated portions and having an upper end portion at the top portion, The perforation is at an angle to the axis of the upper brush holding portion, and one end of the perforated portion of the upper brush portion is provided with a groove forming a hierarchical shape； a brush portion is disposed on the handle portion and the brush portion is attached thereto The fixing portion is provided with a fixing portion penetrating the upper portion of the upper brush holding portion, and the fixing portion is provided with a blocking member opposite to the axial center thereof and disposed at the end of the perforated groove； The upper holding brush portion has at least one locking component and abuts the fixing portion and the expanding groove half-sealed to the brush portion of the punching hole； the shape of the tail blocking member is a spherical shape. With this structure, the brush portion can directly fix the tail blocking member and the expansion groove of the shank without the angle and direction.一種牙間刷柄結構，該牙間刷柄，包括︰一柄部，於其上段設有一上持刷部，該上持刷部設有呈橫向之一穿孔且於頂部具有一上尾端，該穿孔並與上持刷部之軸心呈一角度，該上持刷部之穿孔一端設有形成階層形狀之一擴凹槽；一刷部，係設於柄部其上持刷部，該刷部設有穿設於該上持刷部其穿孔之一固定部，該固定部一端設有與其軸心相對且置於穿孔其擴凹槽之一尾阻擋元件；一固刷件，係設於上持刷部，其具有至少一鎖固元件並抵止半封合於穿孔其所設刷部之固定部及擴凹槽；該尾阻擋元件之形狀係呈圓球形狀。藉此結構，刷部不用對角度及方向，即能將其尾阻擋元件與柄部之擴凹槽直接固定。
