This document discusses isolation of the operative field in dentistry. Maintaining a dry field is important for operative procedures. Several techniques and materials can be used for isolation, including rubber dams, cotton rolls, high-volume evacuators, and throat shields. Rubber dams provide the best isolation but also have some disadvantages like taking time to apply. The goals of isolation are moisture control, retraction of soft tissues, and prevention of contamination. Proper isolation improves visibility, protects patients, and allows dental materials to perform as intended.