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vickong pun
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為什麼新萌出的門牙切端呈“鋸齒”狀？

Posted By vickong pun     July 5, 2021    

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為什麼新萌出的門牙切端呈“鋸齒”狀？

　　為什麼新萌出的門牙切端呈“鋸齒”狀？剛換的門牙切端凹凸不平，就像“鋸齒”一樣，醫學上叫它切脊結節。
是門牙一長出來就有的。等上下牙齒“各就各位”能夠互相接觸了，這些“鋸齒”就會慢慢被磨掉，牙齒就逐漸平整了。

                    

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