A disposable dental tool includes a disposable handpiece and a bit mount and dismount device. The disposable handpiece includes an elongated handle body, a drill head provided at one end of the handle body, and a through holding channel for holding a drill bit thereat. The bit mount and dismount device includes a handheld actuator having a thumb pusher surface and an opposed bit pusher surface, and a pusher bit protruded from the bit pusher surface. The thumb pusher surface of the handheld actuator is held to push the bit pusher surface thereof toward the drill head for mounting the drill bit at the disposable handpiece by pushing the drill bit through the through holding channel and for dismounting the drill bit at the disposable handpiece by pushing the drill bit out of the through holding channel via the pusher bit.
