At what stage does the eruption of a permanent tooth typically begin?

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Once the root development is fully completedWhile the apical third of the root remains under formationWhen approximately half of the root is still developingAt the initial phase of root formation

Explanation

The eruption of a permanent tooth generally begins when about half of its root is still forming. It does not wait until the root is fully developed, nor does it start right at the beginning of root formation. This stage allows the tooth to begin emerging even as root growth continues.