The "tooth happy" disposable dental handpiece , the sizes is one of major components of the oral cavity allround therapeutic equipment ,as a dentist's necessary tool and II category medical instruments, it has three core technologies and seven items of national monopolies, and it uses insert-pull out fixed drill bit which changed the traditional handsets which are all the metal work, its work principle is the same with a traditional non-disposal high speed dental handpiece, and its performance can compare favorably with the traditional dental handpiece. This new handpiece is used in the oral cavity clinic instead of traditional high speed dental handpiece, which solutes the problem not only traditional high speed dental handpieces are difficult to be disinfected but also the expense is so high.