My Jrts and most jrts that I know, have very large teeth for the size of the dog. They should also have a scissor bite, level is ok, but not preferred.
I have seen the teeth of other breeds like poodles etc of similar size of terriers and those breeds the teeth are at least half the size if not a 1/3 of the size. Other than that I don't know what they would mean by it.