VETERINARY DENTAL SURGERT. 155 



the animal works the lower jaw from side to side. 

 Unless this motion is extensive enough to bring the 

 whole table surface into wear, a portion of the tooth 

 will not be worn away. 



In some animals the width of the upper jaw 

 (which is always wider than the lower), exceeds 

 that of the lower to such an extent that it amounts 

 to a malformation. Cases of this kind have come 

 to my notice where only half of each row of teeth 

 came into wear, and that portion remaining out of 

 wear had become so long that it bruised and lacer- 

 ated the gums of the opposite jaw. The lower 

 teeth passing inside the upper had cut deep cavities 

 into the palatine processes. 



This defect may exist in both the right and left 

 side, or on one side only. I have seen two instances 

 where the latter condition was present in the living 

 animal. 



Case i. A. sorrel gelding, the property of a 

 Mr. Williams, Goodland, Ind. The left lower row 

 of teeth was inclined inwards as well as upwards; 

 their internal surface not coming into wear, had 

 continued to increase in length until they penetrated 

 the palatine processes. The external surfaces of the 

 lower molars were worn down to the gums. A 

 like reverse condition was present in the upper 

 molars; the inside of them being worn away while 

 the outside had attained sufficient length to lacerate 



