MOUTH AT 21 YEAES. 



809 



h'ig. 269. — Tables cf incisors (nal. size). 



From Figs. 267, 268 and 269, we see that in old age, the chief 

 alterations in the incisor teeth consist in increased length of their 

 crowns and decreased width of their necks and tables. The curve 

 formed by the tables of the incisors does not become flatter after, 

 say, 14 years. 



