@tkj68 Doubtful but worth a try. Nothing really can bring back the dead. Red light therapy in specific wavelengths seems to quicken the healing process.
I thought my salivary glands were fried as well, only to find out they were either blocked or rerouted after radiation. An additional surgery for something else oral opened up at least one salivary gland, which made life far more pleasant. I guess for you I do not have a good answer.