CHAPTER XXIX. 



DISEASES AND INJURIES OF THE FACIAL REGION — Continued. 



PARROT-MOUTH IRREGULARITIES OF THE TEETH DISEASES OF THE 



ALVEOLAR PROCESSES CARIES OF THE TEETH DISEASES OF 



DENTITION DENTAL IRRITATION IN YOUNG CATTLE DENTAL 



COUGH IN YOUNG HORSES DENTITION FEVER SUPERNUMERARY 



TEETH — DISEASES OF THE FACIAL SINUSES — OZCENA, OR NASAL 

 GLEET. 



DEFOEMITIES OF THE MOUTH AND lEEEGULARITIES 

 OF THE TEETH. 



Parrot-Mouth. — This is a well-kno^vn deformity, and consists 

 in the upper incisor teeth projecting in front and overhanging 

 the lower ones, to an extent, in some instances, of as much as 

 two inches ; in such cases the lower incisors meet the palatine 

 ridges or " bars " when the mouth is closed. 



The teeth of both jaws become much elongated, not being 

 worn off by the attrition which keeps them at a proper length 

 when they meet naturally. 



A horse with a parrot-mouth will feed from the manger very 

 well, but if turned to grass he experiences a difficulty in collecting 

 his food. On this account a horse with a parrot-mouth is not 

 so valuable as he otherwise would be. 



If the lower incisors become so long as to bruise and other- 

 wise injure the " bars " and roof of the mouth, they will require 

 to be shortened with a rasp ; the upper teeth may at the same 

 time be shortened also. 



The upper jaw is naturally broader from side to side than 

 the lower. If tliis natural formation is carried beyond a certain 

 extent, the molar teeth do not approximate during mastication, 

 and consequently a ridge of unworn tooth material is left on 

 the external aspect of the upper, and on the inner sides of the 



