What are the risks of removing a chin implant? And how long should I wait before using injectables?

4 years ago I enhanced my chin with a (9mm/9mm/8mm) implant. After having double jaw surgery 3, 5 months ago the implant is too big and crooked. I read a lot of scary stories about disfigured chins and scar tissue, so I would like to know how big the chance that this may occur is, and how long should I wait before slowly starting to enhance my chin with injectables.