Abstract: A dental instrument with a substantially hollow body is attached to a flexible tube and the flexible tube is attached to the supply outlet of a standard air-water syringe at the dentist's workstation. A locking mechanism may be placed in a first position, with the water supply button of the air-water syringe being essentially disengaged and with the air supply button being unaffected. The locking mechanism may then be rotated from the first position to a second position and the raised portion of the locking mechanism being positioned over the air supply button, thereby “locking” the air supply button in the “on” position. With the air supply button locked in the “on” position, the air supply from the air-water syringe is delivered through the flexible tubing, through the hollow body of the dental instrument, and then directed across the face of the mirrored surface of the dental instrument.