Is he eating and drinking normally? You should be measuring how much food and water are offered and how much is left once when you change it out for fresh (which should be, at minimum, daily).
To me, any problematic chewing would include a mouth or tooth issue -- anything from food stuck in the roof of the mouth to a broken tooth to an abscess or tumor. Then again, it could be nothing. It's difficult to say.
I'm more concerned about the lack of veterinary care available. Hedgehogs are prone to a myriad of maladies, and because minor issues can become major issues very, very quickly, it's unrealistic to keep a hedgehog as a pet without care being accessible and affordable.