Have had this corn for 10 years and recently moved him into a rack system with my ball python collection. He had swelling in his bottom gums so I brought him to the vet and she gave him a shot, the swelling went down so I thought he was out of the woods. That was a little more than a month ago and I open the tub today to see this

I don't know if you can tell from the photo but that is actually a cavity. Do you think he can survive or is he going to be put down?