AGE, AS INDICATED BY TUE TEETH. 



319 



Slope. — An alteration also takes place in the position or " slope " of the 

 teeth, as regards their closing. This is due to the effects of wear. The 



Fia. 161. 

 Shape of tooth crowns in extreme old age. 



original form of the tooth is shown in Fig. 153. Its upper portion, it «rill 



Fig. 163. 

 Slope of the teeth in extreme old age. 



Fig. 163. 

 Closing of the mouth In extreme old age. 



be seen, is nearly perpendicular, whilst the lower part lies in a more 

 horizontal position. Hence in youth the teeth meet directly, whilst 



Fig. 164. 

 Slope of Teeth at Two Tears. 



in extreme age they can scarcely be said to meet at all. Their stumps 

 project forward in two almost parallel lines. (Figs. 163 and 163.) 



