My GTP did something similar once. Turned out one of his teeth were caught in a manner he couldn't realign his jaw. I was able to gently fix the issue myself and he was fine.
It is hard for me to say what you should do but if it were me I would check it out myself and see exactly what you're dealing with. It may be simple or you may see a vet is required. I just can't say with seeing one pic.
I hope it is a simple fix.
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