| S T A G E 3
F I R S T E X C H A N G E |
| Birth to the complete primary dentition |
| First intertransitional period |
| 6-8
years |
| First
transitional period |
| Second intertransitional period |
| Second transitional period |
| Adult dentition |
| R I C H A R D Y O O N |
| 19 |