The Digestive System. 



'59 



gone the first of the permanent set appear. The first of 

 these, often called the "six-year molars," are just back of 

 the hindermost "milk molars." These should receive 

 especial care, as they will never be replaced. Any begin- 

 ning of decay in them ought to receive prompt attention. 



KINDS OF TEETH 

 Incisors 



Canine 



Molars 



TIME OF APPEARANCE 

 7th Month 

 9th " 

 18th " 



Incisors 

 Canine .. .-. 

 Bicuspids ... 



Molars 



TEMPORARY SET 

 Upper 



Lower 

 PERMANENT SET 



Fig. 68. TEETH : Kinds, Arrangement, and Times of Appearance. 



The Care of the Teeth. The teeth need careful atten- 

 tion. They should be thoroughly brushed at least twice a 

 day, on rising and on going to bed. It would be better to 

 clean them after each meal also. If a tooth powder, recom- 



