Objective: The aim of this case series is to achieve pre-implant soft tissue gain in three different patients with insufficient attached keratinized mucosa using the free gingival graft technique. Method and Results: Three patients were included in this case series, all with inadequate keratinized mucosa in the bilateral posterior mandibular region. The first patient was a 48-year-old woman with a systemic disease of hypothyroidism using levotiron who was considered for implant treatment. The second patient was a 64-year-old man with a systemic disease of bladder cancer treated with smart drugs. He had previously received implants in the region of teeth #44 and #46 (FDI), but the implant in the region of #46 was lost. The third patient was a 56-year-old female with a systemic disease of hypercholesterolemia and Behçet's disease who also experienced implant failure in region #46 after previous implant placement. After clinical and radiographic evaluation, all patients were found to have sufficient hard tissue for implant placement and only keratinized soft tissue augmentation was planned. Free gingival grafts were harvested from the palatal region and positioned in place with 6/0 nonabsorbable monofilament sutures. Keratinized mucosal tissue gain was recorded in all patients. Implants were placed in the areas two months after surgery. Postoperative follow-up visits showed positive tissue healing responses. Three months later at the gingival former placement, all implants supporting tissued were healthy. The patients were then referred to the Prosthodontics Department for prosthetic treatment. Conclusion: The presence of keratinized mucosa around implants is an important factor that affects the success of implant treatment, as it contributes to maintaining peri-implant health by creating a cleanable environment and serving as a barrier against the oral environment, both before and after implant placement.