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ugly duckling stage

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A stage of dental development, usually between the ages of 7 and 12 years, preceding the eruption of the permanent canines when the upper central and lateral incisors are tipped laterally due to the crowding created by the unerupted canines, to produce a midline space (median diastema). The midline space is normally transitory and the incisors usually assume normal alignment when the upper canines erupt into position.

Ugly duckling

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