Disclosed is a turbine dental drill mechanism, comprising a turbine (1) and a turbine shaft (2). A balancing chamber (3) is provided on the mechanism, with an automatic balancing component provided in the balancing chamber (3), the automatic balancing component being a metal ball, sand grains or a flexible body (4). Providing a metal ball in the balancing chamber (3) can enhance the balance； providing sand grains in the balancing chamber (3) can reduce noise while also enhancing the balance； and providing a flexible body (4) in the balancing chamber (3) can eliminate noise and adjust the weight, thereby achieving automatic balancing. Disclosed is a dental drill head composed of a head casing (101), a wind wheel and a bearing (102). The wind wheel comprises a wind wheel shaft (103) and wind wheel blades (104), with a dynamic balancing hole (112) provided at an end of the wind wheel shaft (103), a dynamic balancing body (113) being provided inside the dynamic balancing hole (112). Providing the dynamic balancing body (113) inside the wind wheel shaft (103) can automatically adjust the imbalance of the rotating parts on the basis of keeping the original outside dimensions of the dental drill unchanged. Furthermore, a spline hole (121) can be provided at an end of the wind wheel shaft (103) with a spline (122) inside the spline hole (121) in a clearance fit. The end of the spline (122) extending out of the wind wheel shaft (103) is fixed to a dynamic balancing plate (123), and the dynamic balancing plate (123) can significantly adjust the dynamic balance, thereby reducing the costs of high precision machining.
