What is this nasty smell and taste after tooth implant?

the area were the stitches are has a bad smell i also have stitching at the root of my mouth with a white seal feeling thing. i guess its supporting the front tooth that got replaced. this smell or taste wont go away how long with this take to heal? the are by the stitching isn't inflammed or hurting or has any bumps it;s just a bit greyish. is this because the gum flesh is dead?, a wet scab or is this apart of healing