Instrument Rubber Dam forceps Ivory used to carry the clamp to the tooth. They are designed to spread the two working ends of the forceps apart when the handles are squeezed together. The working ends have small projections that fit into two corresponding holes on the rubber dam clamps. The area between the working end and the handles has a sliding lock device which locks the handles in positions while the clinician moves the clamp around the tooth. Forceps do not have deep grooves at their tips or they become very difficult to remove once the clamp is in place.