Abstract: An apparatus is provided for dispensing washers for controlling a depth a penetration of a reamer during root canals. The apparatus has a body including a recess for storing a number of washers to be positioned on the reamer. The body also has a washer access door with an aperture, mounted on said body. The recess within the body has oppositely disposed side walls which converge to a notch at a location proximate said access door and top and bottom walls bounding said notch. The top wall has a passageway and aperture formed in said top wall above said notch for receiving said access door within the passageway between the top wall and recess, the access door being slidably movable between a first position in which the aperture of the top wall and aperture of the access door are in registration with the notch to permit a washer within the notch to be engaged by said reamer, and a second position.