2. What work do the front teeth do? the back teeth?

3. What are the teeth made of?

4. What causes the toothache?

5. How is the enamel often broken?

6. Why should a tooth-pick be used?

7. Why should the teeth be well brushed?

8. When should they be brushed?

9. What bones form a case or box?

10. What is the upper room of this box called? the lower room?

11. What organs are in the chest? the abdomen?