CHAPTER II. 

 TEETH. 



THEIR STRUCTURE AND COMPOSITION, DENTINE, ENAMEL, 

 CEMENT KINDS OF TEETH INCISORS, CANINE AND 

 MOLARS DEVELOPMENT OF THE TEETH. 



Teeth are firm substances implanted in and pro- 

 truding from the maxillary alveoli, adapted for seiz- 

 ing, lacerating dividing and tricturating the food. 

 They are the chief agents in the mechanical part of 

 the digestive function. The teeth are intimately re- 

 lated to the food and habits of the animal. They 

 vary in size, form, structure, position, attachment and 

 number. But in all cases they are in correlation with 

 the food and habits of the animal. 



In Herbivora, the contacting surfaces of the 

 molars are flat and rough for grinding the food. In 

 Carnivora the molars are sharp and pointed to tear 

 and crush the food. In Omnivora where both pro- 

 cesses are used the teeth are mixed in their character. 



A tooth is the most durable part of the animal 

 body, and is frequently the sole remains of an 

 animal. 



Teeth consist of a cellular and a tubular basis of 

 animal matter containing earthy particles, a fluid and 



a vascular pulp. 



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