THE TEETH 99 



ten, divided into two sets of five on each side. In each 

 of these sets of five, there are found in front two sharp 

 teeth with edges like a chisel for cutting, called incisors. 

 Next to these at the sides is one pointed tooth for tear- 

 ing, called from its resemblance to the corresponding 

 tooth in the dog, the canine. Last of all come two back 

 teeth with broad irregular flat tops for grinding, which 

 are appropriately named molars. 1 



Permanent set. When the child is almost six years 

 of age, another molar appears at the back end of each 



Central' incisor 



FIG. 64. The jaws of a child of seven and a half years, with the external table of 

 bone cut away to show how the teeth of the second set push their way out. 

 (Testut.) 



series of five. These four molars are the first of the 

 permanent teeth. The next of the permanent set to 

 come are the incisors, which push their way out from 

 under the temporary teeth. The roots of the temporary 

 teeth are destroyed by the pressure of the budding teeth 



1 Latin, molere, to grind. 



