Management of the developing dentition and occlusion performs early and healthy oral optimization by diagnosing and treating their malocclusion and dysfunction in optimal period. We treated a posterior open-bite triggered by an impacted tooth with ankylosis. Her second primary molar was impacted with ankylosis of the buccal roots. She usually had her tongue thrust against her right posterior teeth. Timely and actively accelerated eruption of her second premolar was produced by extracting her second primary molar with fenestration. Her result shows the importance of improving oral habits and treating the submersion in the optimal period during early growth.
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