Our teeth are adapted for our lifestyles.

Looking at human teeth:
Use a mirror to find the different kinds of teeth. (see notes)
Name incisors, canines, molars (use illustrations to show the different types)

Looking at a carnivore’s teeth:
First let’s look at predators teeth. What do predators eat - meat. Called a carnivore.
Need sharp teeth to catch prey and rip meat. Canines are huge, and even on domestic animals they can be terrifying (show cat and dog photo). Incisors are tiny. Molars are sharp to shred meat.
Look at real carnivore skull to see teeth (e.g. I have cat skull with upper jaw including canines)

Looking at an herbivore’s teeth:
Plants are tough.
First plant eaters need to snip off the plants. Which teeth do they use for this? Incisors. (show horse teeth photo)
Grind the plants. Molars have sharp ridges on the top and fit together perfectly to smash the plants open and get the energy out of them.
Look at real herbivore skulls to see the teeth. (Photos show, from top, moose, vole, deer lower jaws.)
Put the deer jaws in the skull to show how tightly the teeth fit together to crush the plants. Show how the jaw moves sideways to mash the plants between the teeth.

Omnivore’s teeth:
What about us?
Canines are there but small - between the two.
Incisors are more like herbivores though no where near as big.
Molars are between the two.
We are omnivores. Same as bears and racoons.

Each type of teeth are an adaptation for the animal's environment.