254 VETERINARY LECTURES 



This makes a full total of forty-four teeth — i.e., twelve incisors, four 

 canines, four anterior premolars, twelve premolars, and twelve 

 molars {par. 347). The incisors, canines, and three first premolars 

 are temporary, or milk teeth, while the anterior premolars and true 

 molars are permanent. 



373. Incisors and Tusks. — Two sharp-pointed teeth are to be 

 seen on both sides of each jaw at birth, with an open space in front, 

 and these are the temporary corner incisors and tusks. About the 

 fourth week the central temporary incisors make their appearance, 

 being well in wear by the seventh or eighth week, and about the 

 twelfth week the lateral temporary incisors are seen. Between the 

 seventh and eighth month the corner incisors are replaced by per- 

 manent teeth, which are well in w T ear at nine months, while the 

 permanent tusks are now making their appearance through the 

 gum. When the pig is twelve months old the central temporary 

 incisors are replaced by permanent ones ; and when about eighteen 

 months old the lateral permanent incisors take the place of the 

 temporary teeth, and the central incisors show signs of wear at their 

 edges. 



374. Molars and Premolars. — Between birth and up to four 

 weeks old three temporary pre-molars on each side of each jaw, 

 above and below, are seen, the second and third coming through 

 before the first. The fourth tooth, or first permanent molar and 

 the anterior premolars make their appearance between the fifth 

 and sixth month, and are well up at the ninth month. From ten 

 to twelve months the fifth tooth or second permanent molar is seen, 

 and about three months after (fifteen months old) the three first 

 temporary premolars are shed, and permanent teeth take their 

 place ; while between the seventeenth and eighteenth month the 

 sixth tooth and last permanent molar is forward. And after this 

 the teeth wear and become dark in colour. Dental derangements 

 in pigs are, however, of rare occurrence, and veterinary aid is seldom 

 or never required. 



375. For further information on the subject of the dentition of 

 the horse, cow, sheep, and pig, the reader is referred to Professor 



