Dental Bone Graft with non adherent gum tissue 3 weeks out. (photo)
Doctor Answers 1
Healing after bone graft
from the picture you have provided it seems that you have a membrane covering the bone graft. The type of this membeane seems to be Gortex ( cytoplast) which will be removed after 21 days.
This membrane could be left exposed , and it is designed so that new gum tissue grows underneath it to cover the bone. Once it is removed , the flaps of gum that you are concerned about not attaching , will close up.
So your healing looks normal. If you are still concerned book a follow up appointment to see your surgeon