Chin Implant Too Big, Can't Close Mouth? (photo)

I had chin augmentation almost 4 wks ago now , and my lower lip is still unable to join the upper one. Tissue is stretched over chin due to size I chose (+8mm) , implant is subperiostal (coralline) and will integrate as bone within 5 monthes. This type of implant has no resorption usualy mentalis muscle has been reattached , I think properly ?because muscle is competent ,lip is rising ok (I can touch upper lip ) I completly satisfy with size , I just fear not beeing able to close mouth anymore!