This type of reconstructive plastic surgery is typically used to repair defects left behind after traumatic injury or mastectomy (breast removal surgery). Flap techniques can also produce excellent results in facial reconstruction after skin cancer removal (known as Mohs surgery).
You will barely feel any pain when getting the gum flap surgery because the doctors will administer local anesthesia to suppress it. However, you may feel some discomfort after the surgery and might require some pain medications to alleviate the pain.