Which one of the following represents the normal adult human dental formula?

$\frac{2123}{2123}$ is the permanent dentition formula.

This formula represents one half of the mouth, with the upper jaw (maxilla) and lower jaw (mandible) shown separately. The numbers indicate the number and type of teeth in each half of one side of the mouth. The sequence is usually incisors, canines, premolars, and molars.