Why does the dental system in animals has different types of teeth?

1. In herbivores incisors are absent and molars are flat as they require grinding of leaves.
2. Carnivores possess teeth that are meat eaters have defined canines to tear out meat.
3. Omnivores evolve teeth with both molars and canines as they are plant and meat eater both.
4. The above examples conclude that the teeth given to animals are different because of their different eating habits