사람들은 왜 치아를 바꿔야합니까? ?
모든 사람은 생애에 두 세트의 치아를 가지고 있습니다 :아기 치아와 영구 치아. The baby's baby's birth begins to grow 6 months after the baby is born; at the age of 6, the baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby's baby' 이제부터 나는 영구적 인 이빨의 세계에있을 것이며 당신이 늙어 갈 때까지 당신과 함께있을 것입니다. 치아 교체는 어린이에게 매우 중요합니다. 따라서 아이들은 치아를 보호하고 아침과 저녁에 멀리두고 식사 후 입을 헹구어 야합니다.
