Fig.4: the side view of the chipped tooth with the root (R) on the top and the crown (C) on the bottom.  The white arrow and white No.1 point to the crack line, whereas the black arrows direct against the junction between the root and crown.  It is understood that the crack line extends underneath the gums (which attach to the root), causing excruciating pain when the patient chews.  Return to the main article.