80 



DISEASES OF THE TEETH. 



and sometimes twelve incisors, have been seen in the lower 

 jaw, constituting a double row of teeth. 



In all our domestic animals peculiar deviations from the 



Fig. 44. 



natural development and eruptions of the teeth are observed 

 These are calculated occasionally to give rise to very serious 

 local destruction and general disturbance. In the first place, 

 we must refer to displacement during growth. Thus an 

 incisor tooth may be seen to protrude on one side of the jaw, 

 instead of being situated in a row with the rest. This is 

 called a buck tooth, and requires removal. Sometimes the 

 temporary tooth must be extracted in order to admit of the 

 straight eruption of the permanent one. 



When teeth are not in apposition, their continued growth 



