I had a similar case. A Ceratoprhys bbs with mouth half open. Use food supplemented with tetra Reptocal D3 and a tube with UV 2.0 (8-10 hours per day on). The animal at the end has his perfect jaw. I've been a long time. He lived all that time in a tupperware because substrate swallowed by having an open mouth.
I still think I'm not vet and maybe have some other problem. I hope you can understand my point of view.