I want to add that low sodium chicken broth might help and then puree his soft food before feeding with a little broth or water.. He needs to lick his food. not chew on it. Best of luck to you and your kitty!
I think he could have what is called Feline Oral facial Pain Syndrome. My 18 year old kitty has it. She paws at her jaw after or during eating. First you need to rule out a possible obstruction in her mouth. Otherwise, I think that what is going on. She needs to go to a vet for diagnosis...
