NINE YEARS. 



The "mark" has, generally, left the upper front incisors. The 

 table of the lower front incisors is nearly round ; its central enamel 

 is triangular in form ; and its dental star is well defined and placed 

 in its centre. Before this age, the central enamel was broad, from 

 side to side ; and narrow, from front to rear. The tables of the 

 lower middle incisors tend to become triangular in shape ; while 

 those of the corner ones are more or less oval. 



