Four days ago I had tooth number 19 extracted and a bone graft done at the same time. I received the non-dissolvable stitches and four days later I am now noticing one whole side of stitches completely lifts up and I cannot feel the membrane anymore . I also from the start and noticed that the surgeon left my stitches on trimmed and maybe at night I was pulling on it because I grind my teeth. Did I swallow the membrane? Why does the whole mass of stitches lift up???Will this bone graft heal OK without the membrane?Is this normal? What happened here?