328 



HEALTH AND DISEASE 



Marginal Irregularity. 



— The commonest irregu- 

 larity of the molar teeth is 

 that in which the outer edge 

 of the upper molars, and the 

 inner margin of the lower 

 ones, become ragged and 

 protrude beyond the corre- 

 sponding margins above and 

 below respectively (fig. 122). 



Fig-. 122. — Undulating Irregularities of Molars 



a, Right side of upper 

 jaw, showing (1) excavation 

 of the bone and abnormal 

 wear of the inner surface of 

 the teeth. 



B, Lower jaw, showing 

 cin'i-fspoiiding teeth simi- 

 larly worn on the outer 

 side as in fig. c, and exca- 

 vation of the jaw (1) by the 

 downward projection of the 

 upper molars. 





Fig. 123.— Marginal Irregularities of Teeth 



