Effective gingival retraction prior to taking an impression without damaging periodontal tissues is very important in long term success of cast restorations. For restorations to survive long-term, the periodontium must remain healthy. The goals of operating field isolation are moisture control, retraction and harm prevention. This book covers need for isolation, different methods of achieving moisture control, mechanical methods of fluid control, about rubber dam isolation, Gingival Biotype, Surgical and Non surgical techniques of gingival retraction and recent advances.