Hi, I have performed many facial shaping procedures, including Chin Augmentation with dermal fillers or silastic chin implants, for over 30 years. Numbness from a chin implant placed through a small, incision under the chin typically resolves in a few weeks. However, an Extra Large sized chin implant has very wide and thick wings that can impinge upon the mental nerves on one or both sides. This is a significant disadvantage of using such a large implant. A 3-D facial scan might show nerve impingement however, after 5 years there's simply no guarantee that implant removal would allow the nerve to regenerate and function. If the implant was placed through the mouth, the additional tissue dissection required to properly place the implant can also place these nerves at further risk of injury. When the chin is weak, this creates an imbalance making the nose appear larger, the mid face top heavy, the lower face looks short, de-emphasizes the lips and allows early formation of a "double chin". Proper placement of a silastic chin implant adds forward projection to the chin thereby creating harmony and balance to the lower face. Using the same incision, liposuction can be performed to reduce the fat and further shape the neck. Excess skin, from below the chin, can also be removed through the same incision. I have found that placement of a silastic chin implant, through a small curved incision under the chin (also allows excess skin removal) to be very safe, quick, highly effective and far less invasive than a sliding genioplasty (requires extensive tissue dissection, bone cuts and placement of metal screws and plates to secure the cut segments of bone). I perform chin implant surgery in 30 minutes or less, often using a local anesthetic alone. In my opinion, you are a good candidate for chin implant surgery. Hope this helps.