Will the gum my dentist cut off grow back? (Photo)

it all depends ....If the bone  in between these teeth is healthy and in proper position, this tissue might fill in over time If there is bone loss , depending on the distance from this bone  to the contact between your front teeth , this black traiangle might never filll in ...I would give it a few months Keep the area cleanSee your dentist for an X-ray Ideally you should get the gum filled back in , if not Your dentist can add White resin filling to move the contact between the front teeth higher to close this gap ....