Fig.1.  There are two or three molars (M) and two premolars (P) in each of four quadrants in our mouth.  A premolar is smaller than a molar.  It is not rare to have one or two extra premolars (P'), usually in a wrong place. Boxed areas with 2 and 3 are going to be enlarged in Fig.2 and 3, respectively. Return to main article

Xin Wei, DDS, PhD, MS 1st edition 07/14/2012, last revision 07/15/2012