I had a silicone chin implant inserted in 2015. 4 years later, I am still unhappy with it. I feel it is to big for face and since I have had it, my smile has been ruined. My bottom lip now stays flat when I smile instead of making. "U" shape like it used to. I refuse to smile much anymore and I have suffered depression because of it. It still feels really tight and looks too big. Is it the physical size that's preventing my bottom from making a "U" shape or could it be nerve damage?