So I had a chin implant 3 years ago, while im happy about the side profile, I still think the width of the implant is big for my face and would like to change the implant to a slightly narrower one, also, my implant is not perfectly centered to my face and im not sure if the implant migrated by time? I have asked my surgeon if he will be fixing the implant with screw and he assured me there is no need for them. Can and implant simply be substituted in one surgery or is there a healing period