Is it possible to determine what a chordate animal eats by the structure of its teeth? If so, how?

By the structure of the teeth, it is possible to determine not only what chordates eat, but also any other animals that have teeth. The structure of the teeth can tell about what the animal eats, how often, whether it preys on other animals or is a scavenger or herbivore. For example, fangs can indicate not only that the animal is predatory, but also that the animal is defending itself or attacking others. Chordates are no exception. It is not necessary to follow the life of chordates in order to know what a particular species feeds on. It is enough to study the structure of the teeth.