FIFTEEN YEARS.—The angle with which the teeth meet is greater than at twelve, the teeth are smaller and dental stars are represented by dark round spots in all of the inferior incisors. The tables of the nippers and dividers are triangular.
SEVENTEEN YEARS.—All of the tables of the lower incisor teeth are triangular. The teeth are narrower and smaller than at fifteen. The profile of the incisors, viewed from the side, is quite angular. The dental stars are prominent.
NINETEEN YEARS.—All of the signs of the seventeen-year-old mouth are more prominent. The cups have usually disappeared from the upper incisors.
[Footnote 1: This table is from dentition tables given in "Age of the
Domestic Animals," by Huidekoper.]
QUESTIONS
1. Name the different kinds of teeth; state the arrangement and number.
2. How is the age of an animal determined?
3. Give the time of replacement of the temporary incisor teeth.
4. How is the age of the animal determined between the fifth and ninth
years?
5. What changes in the appearance of the table surfaces occur between ten
and fifteen years of age?