| S I X S T A G E S |
| Birth to the complete primary dentition |
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| Identifiable Periods |
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| First
intertransitional period |
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| Continuum of Activity |
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| First transitional period |
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| Quiescent Interludes |
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| Second
intertransitional period |
| Second transitional period |
| Adult dentition |
| R I C H A R D Y O O N |
| 3 |