YOU SAID:
He has grown a little long in the teeth
INTO JAPANESE
彼は歯が少し長くなった
BACK INTO ENGLISH
he got a little longer teeth
INTO JAPANESE
彼は少し長い歯を持っていた
BACK INTO ENGLISH
he had long teeth
INTO JAPANESE
彼は長い歯を持っていた
BACK INTO ENGLISH
he had long teeth
Come on, you can do better than that.