Universal Numbering System

The Universal Numbering System, also known as the American System, is a standardized method for identifying and referring to teeth in dental practice across the United States. This system assigns numbers 1-32 to each adult tooth, starting from the upper right third molar (wisdom tooth) and continuing clockwise around the dental arches. Unlike the FDI World Dental Federation notation used in most other countries, the Universal Numbering System provides a straightforward sequential approach that helps dental professionals communicate effectively about specific teeth during examinations, procedures, and patient records.

This detailed chart compares five major dental notation systems across both deciduous (primary) and permanent dentitions, presenting a side-by-side visual reference of how each tooth is designated in different numbering conventions.