Deterioration of Lower Facial/jaw Muscle

I had consultation with a maxillofacial surgeon discussing alternative to orthogonathic surgery (which im not considering) to shave the angle jaw joint on the right side of my face to make it appear more symmetric but this would only shorten it height but not bring it out. Im 24 now & have noticed dramatic changes since the past 3 years as though the muscle mass has deteriorated & made my jaw look reclined. I want to know if and what procedure can bring back the muscle mass as I had before

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