When does phase one of arch development occur for the permanent dentition?

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Phase one occurs when the permanent first molars erupt.These teeth add dramatically to chewing efficiency and jaw development during a period of rapid growth of the child.Phase two occurs with eruption of the permanent anterior teeth.Phase three in the development of the form of the dental arches begins when the permanent premolars erupt.Phase four begins when the permanent canines erupt.Phase five consists of eruption of the third molars.

When Does Phase One of Arch Development Occur for the Permanent