YEARLY WEAR OF TEETH 



265 



shows how much of the tooth will be worn away when it 

 has been in wear two years. The fourth cut from the 

 left shows a front incisor which came up at three years 

 of age and has been in wear three years. The cup has 

 nearly or quite disappeared, which occurs at six years 

 of age. When the horse reaches nine years of age, the 

 cut shows that about three -eighths of an inch of the 



At 3 years. 4 years. 5 years. 6 years. 9 years. 20 years. 



FIG. 78. Shows the wear of an incisor tooth and why the cups, or marks, dis- 

 appear as age advances. The lower nippers wear away about one-eighth of 

 an inch each year. The upper incisors wear away more slowly. 



tooth has been worn away below the cup. At twenty 

 years, the tooth shows much wear. The direction of 

 wear, as shown by the cross line, has changed. Note 

 the angle and how different it is from the visible angle 

 of the teeth of a young horse. 



Turn back to Fig. 74, as it will assist the eye and 

 the judgment in distinguishing between a tooth which 

 has just come in wear and one that has been in wear 



