Tooth change

Below the root of each deciduous tooth, there is a permanent tooth germ that gradually grows and grows toward the oral cavity. During the germination process of permanent teeth, on the one hand, the alveolar bone between the deciduous tooth root and the permanent tooth germ is compressed, and through the action of osteoclasts, the bone resorption is thinned until it is completely absorbed; on the other hand, the deciduous tooth root is directly compressed , So that the roots of deciduous teeth are gradually absorbed and become shorter and shorter until they completely disappear. As a result, deciduous teeth began to fall off, and permanent teeth gradually grew.

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