An assembled device for retrieving broken pieces from a root canal includes a hollow hand-held pole, a needle socket which connected to a needle cannula. An insert unit and an insert holder are inside the hollow hand-held pole. A sliding push button is outside the hollow hand-held pole which can move the insert unit up and down. The insert wedge extends to the needle cannula through the needle socket and move up and down a curved and beveled end of which engages the broken instrument and urge the broken instrument into the cutout so the device will mechanical grasp the broken instrument A cutout is spaced from the end of needle cannula. The present invention has a compact structure and stable performance. The vulnerable part can be replaced easily. It can work under the dental microscope and can also work as MTA carrier.
