50 



ANIMAL DENTISTRY. 



of wear until at the age of two and a half years there remains 

 only a loosened shell. 



LATERAL INCISORS. 



The lateral incisors make their appearance at from four 



to six weeks, gain the level of the arcade at four months, 



and are replaced by permanent incisors at three and a half 



years. 



CORNER INCISORS. 



The corner incisors appear on the buccal surface at about 



Fig. 34. 

 Temporary Incisor Teeth of a Horse. 

 A. B, C. Labial surface of centra!, lateral and corner. 

 D', E, F. Lingual surface of same. 



seven months, gain the level of the arcade at ten months 

 and are shed at four and a half years. 



FIRST, SECOND AND THIRD MOLARS. 



These teeth api)car about the time of birth. They are 

 large organs and occupy the whole maxillary margin behind 

 the interdental space. At the time of eruption their tables 

 arc covered with enamel, whicli soon wears off to expose 

 the dentinal tissue and cement. Their fangs are g-radually 

 lost by absorption from pressure of the growing- permanent 

 molars beneath. The first and second are shed at two and 

 one-half years and the third at three to three and a half, 

 leaving the molar arcades free from temporary teeth 



