The present invention discloses an extension sleeve for a dental handpiece drill bit that includes an extension sleeve. The upper end edge of the extension sleeve is a neck portion, and the lower end edge is a sleeve portion； the neck rod is pivotally connected to a driver of the dental handpiece, and the sleeve portion has a fitting hole, a blocking portion and a protruding portion, and the sleeve portion is available The pivotal end of the drill bit is fixedly fixed and the drill bit can be rotated with the rotation of the extension sleeve； thereby, the drill bit has an extended function, which greatly facilitates the drilling of the alveolar bone of the dental handpiece.本創作揭露一種牙科手機鑽頭的延長套筒，其包含一延長套筒。該延長套筒上端緣為頸桿部，下端緣為套筒部；該頸桿可樞接牙科手機的驅動器，該套筒部具有嵌孔、擋部與凸出部，該套筒部可供鑽頭樞接端銜接固定，並使鑽頭可隨延長套筒之旋轉而轉動；藉此，鑽頭係具有延長功能，使牙科手機進行齒槽骨的鑽孔工作產生極大助益。
