Certified Instrument Specialist (CIS) Practice Exam 2025 - Free CIS Practice Questions and Study Guide

The primary purpose of instrument milk in sterilization processes is to protect instruments and inhibit rust. Instrument milk acts as a barrier that prevents moisture, which can lead to corrosion, from coming into direct contact with the metal surfaces of the instruments during sterilization and storage. This is particularly important because many surgical and dental instruments are made from materials that can easily rust if not properly cared for. By using instrument milk, the lifespan of these tools is extended, reducing the need for replacements and ensuring they remain safe and effective for medical procedures.

While enhancing the appearance of instruments or acting as a cleaning solution might be considered benefits in some contexts, the critical function of instrument milk is its protective qualities. Moreover, promoting rust and discoloration is counterproductive to its intended use. The focus is on safeguarding the integrity of the instruments so they can perform reliably in medical settings.