I had a mini implant placed 6 yrs ago and the crown that was cemented on is sitting really low on my gum line and is really bulky. My Q is can I have it replaced without compromising the integrity of the implant? Is there a possibility it could looks worse than it already does? I have a metal abutment, would it need replaced? My gum is also really dark can I have that fixed? What are my options for all my questions?