Hu̍t-hòa-bu̍t ē pang-chàn khí-iū-chit ê koh-kài-hòa (recalcification); khí-iū-chit tú-tio̍h sng ē thoat-kài-hòa (decalcification), jiân-āu tī chhùi-nōa tiong koh-kài-hòa, 1-lâi-1-khì chi-kan nā thoat-kài-hòa khah-chē tio̍h chiù-khí, nā koh-kài-hòa khah-chē tio̍h-bē chiù-khí.