[AmityvilleHams]

I'd try Harry Hamster then.It's a very good choice for Syrians,and would be a lot better than your current diet.The main diet's variety is what is most important,and while extras can be good they don't get factored into how varied the most significant portion of a diet is(which currently is fairly low,and needs work).Burgess' Syrian food isn't that good anyways(their dwarf food is excellent though).Selective feeding with Harry Hamster is relatively unheard of anyways,although with other foods it's more common.

From my perspective the loose jaw is fairly unlikely to be coming from a diet problem,as it's most likely something related to a prior injury(among other things).