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In oral surgery, there are two principles required for better performance: (1) adequate visibility that depends on three factors (sufficient access, light, and a surgical field free of excess fluid like blood) and (2) assistance. Surgical techniques can be divided into three main classifications like resective, minimally resective, and non-resective techniques. In periodontal non-resective technique, designing the flaps has an important role. We can achieve enough access by designing appropriate flap. Three major factors must be followed to prevent the complications of flap surgery: (1) prevention of flap dehiscence, (2) prevention of tearing, and (3) prevention of flap necrosis [1]. Regarding the benefits of each flap design and the aim of surgical procedures, the surgeon should have decided on flap design. In this chapter, we mentioned several important flap designs since 1974.