HELPS IN LESSON PREPARATION 335 



CHAPTER XXII 



1. Give some advantages of well-formed, healthy teeth. 

 2. What is the crown of a tooth? The root? What is 

 the enamel? The dentine? 3. How many teeth are in 

 the temporary set? In the permanent set? 4. De- 

 scribe the incisors; the canines; the bicuspids; the molars. 

 What are the wisdom teeth? 5. Tell what causes teeth 

 to decay. 6. Describe a good way for thoroughly cleans- 

 ing the teeth. If this is done but once a day, what is the 

 best time? 7. Explain the benefit of using dental floss. 

 8. Why is it well to follow the cleansing of our teeth with 

 an alkaline mouth wash? 9. What makes an inexpensive 

 but excellent tooth powder? 10. How often, at least, is 

 it well to have one's dentist examine the teeth? 11. Ex- 

 plain why it is foolish to delay going to a dentist when we 

 know we have a cavity in a tooth. 12. Tell what tartar 

 is, and why it should be removed. 13. State with what 

 the blood must supply our teeth in order to keep them 

 healthy. What foods supp'y such materials to the 

 blood? What foods do not? 14. Of what benefit to 

 the teeth is active exercise? 15. Why should the first, 

 or temporary teeth, be kept clean and free from decay? 

 16. Explain about the sixth-year molars. 17. Show 

 how losing temporary teeth before their natural time may 

 cause the permanent set to be irregular. 18. What harm 

 may come to the teeth of a little child from allowing it 

 continually to suck its thumb, or something similar? How 

 may this be prevented? 19. By whom can an irregular 

 set of teeth be straightened ? When should this be done ? 

 20. Explain the possible harm from cracking nuts; biting 

 thread; picking the teeth with a pin, knife, or any sharp 

 instrument; following hot drinks or food with cold, or vice 

 versa. 21. Why should medicines containing iron or 



