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為什麼剛換出的牙顯得特別大?恒牙一萌出,它的牙冠大小就已經與成人牙冠的大小相近,相對兒童尚未發育成熟的臉龐,自然會顯得有些不協調。
不過這種情況只是暫時的,隨著小朋友的發育成長,這種不協調感會自然而然消失的,到了成人就變得自然和諧了。
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