Fig.3 Exam shows that the tooth has a lot of wear and tear.  In the middle of the tooth is the yellowish dentin (D) without covering of enamel (E, whitish).  Additionally, there are no normal structures a young molar should have, such as cusps and ridges (R in Fig.3').  The most striking feature of this worn tooth is a distinct crack line (arrowheads).  The area with * in the young molar (Fig.3') is still covered by thin layer of enamel.  Less yellowish dentin is discernible, as compared to that in Fig.3.  Unfortunately this young molar has cavities (arrowheads), back to original text

Xin Wei, DDS, PhD, MS 1st edition 04/14/2011, last revision 09/27/2012