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The exfoliation of the deciduous teeth is mainly brought about by resorption of their roots and enhances by growth and eruption of the succeeding permanent teeth. 總而官之，乳牙之所以會脫落主要在于它們的根部會發(fā)生吸收，而其下正在萌出的永久齒則增進了它在根部進行吸收的工作。