The formula for the permanent teeth is:
( 3 1 4 2 )
2 ( I - C - P - M - ) = 42
( 3 1 4 3 )
All of the teeth have short crowns and distinct necks; they erupt
rapidly. The crowns are white, being destitute of cement.
The =incisors= are placed almost vertically and close together in the
jaw-bones. They do not correspond to an opposing tooth, but rather to
parts of two teeth of the other jaw. The crowns are trituberculate, the
central projection being the largest. They increase in size from the
first to the third. The labial surface is convex, the lingual slightly
concave, and marked off from the neck by a =V=-shaped ridge, the
cingulum. The roots are flattened transversely. The lower incisors are
smaller than the upper ones. One or two supernumerary teeth may be
present.
[Illustration: