An endodontic file clip for an apex locator, comprising: a hollow body; a push button movably linked to the body; a spring pushing the push button away from the body; an electrically conductive hook movably arranged within the body and partly protruding out of the tip of the body and fixed to the push button to securely attach an endodontic file to the tip when the push button is released towards the closed position, and disengage from the endodontic file when the push button is pressed towards the open position; wherein the hook has an u-shaped portion; characterized by further comprising: a detachment mechanism for re-attachably detaching the push button, the spring and the hook from the body for cleaning and disinfection in a dental washer disinfector, wherein the detachment mechanism comprises a detachment slot at a back portion of the body near the tip averted from the u-shaped portion of the hook, to allow manual detachment of the push button, the spring and the hook from the body when the hook is manually tilted for alignment into the detachment slot, and wherein the body has a notch near the tip; and the u-shaped portion is attached to the notch when the push button is in the closed position, and is detached from the notch when the push button is in the open position, wherein the notch and the u-shaped portion constitute a first security mechanism which blocks the detachment mechanism when the push button is in the closed position, and unblocks the detachment mechanism when the push button is in the open position. a hollow body; a push button movably linked to the body; a spring pushing the push button away from the body; an electrically conductive hook movably arranged within the body and partly protruding out of the tip of the body and fixed to the push button to securely attach an endodontic file to the tip when the push button is released towards the closed position, and disengage from the endodontic file when the push button is pressed towards the open position; wherein the hook has an u-shaped portion; characterized by further comprising: a detachment mechanism for re-attachably detaching the push button, the spring and the hook from the body for cleaning and disinfection in a dental washer disinfector, wherein the detachment mechanism comprises a detachment slot at a back portion of the body near the tip averted from the u-shaped portion of the hook, to allow manual detachment of the push button, the spring and the hook from the body when the hook is manually tilted for alignment into the detachment slot, and wherein the body has a notch near the tip; and the u-shaped portion is attached to the notch when the push button is in the closed position, and is detached from the notch when the push button is in the open position, wherein the notch and the u-shaped portion constitute a first security mechanism which blocks the detachment mechanism when the push button is in the closed position, and unblocks the detachment mechanism when the push button is in the open position. a detachment mechanism for re-attachably detaching the push button, the spring and the hook from the body for cleaning and disinfection in a dental washer disinfector, wherein the detachment mechanism comprises a detachment slot at a back portion of the body near the tip averted from the u-shaped portion of the hook, to allow manual detachment of the push button, the spring and the hook from the body when the hook is manually tilted for alignment into the detachment slot, and wherein the body has a notch near the tip; and the u-shaped portion is attached to the notch when the push button is in the closed position, and is detached from the notch when the push button is in the open position, wherein the notch and the u-shaped portion constitute a first security mechanism which blocks the detachment mechanism when the push button is in the closed position, and unblocks the detachment mechanism when the push button is in the open position.