I heard that animals usually have teeth in excellent condition, and the suggested explanation was that eating soft, processed, cooked foods is not what our teeth evolved to do, and so ours fall into disrepair.
I'd say the big difference is the sugar. If I brush my teeth and then eat only meat for a whole week, my teeth are still incredibly smooth - giving the feeling of having clean teeth. On the other hand, if I eat a piece of chocolate or just one toffifee, in a couple of hours my teeth get very fuzzy - the tongue no longer glides across them smoothly.
