Uh, I think Godzilla's jaw can crush bone. It's kind of hard to depict that kind of bite strength with suitmation. He could probably snap his jaws shut around something like a croc does and you'd never get it open again without breaking his jawbones.
His bite strength is probably several tons per square inch.
Of course, the jaw strength could vary depending on which version of Godzilla it is.
That's my theory