Relieved tooth improved structure for building machines and tools

The utility model discloses a relieved tooth improved structure for building machines and tools, which includes a tooth seat and a tooth tail sleeved at the tooth seat, wherein the tooth seat is provided with an accommodating room and a fixed-connection section; punching holes are arranged on two sides of the tooth tail respectively; a clamp-pull unit is arranged in the accommodating room and the fixed-connection section of the tooth seat and correspondingly positioned between the punching holes of the tooth tail, and includes a retaining pillar, an elastic piece and a fixing piece, wherein the retaining pillar convexly extends out of one end of the accommodating room to form an outer guiding angle facing to on one side of a fixing part, so as to be propped against and jointed to an inner guiding angle of the corresponding punching hole on the tooth tail, as a result, the retaining pillar can limit the tooth tail to be positioned on the tail seat and keep no hit clearance between the tooth tail and the tooth