Use your thumb and forefinger to gently work the floss between two teeth, being careful not to pull it roughly or saw it back and forth, both of which can injure the gum.
用你的食指和拇指轻轻地在两齿之间拨动牙线，小心一点不要太粗鲁或前后牵动，这样会伤害到牙龈。
Yesterday I went to the dentist to pull out one of my decayed teeth.
昨天我去牙科医生那儿把我的一颗蛀牙拔掉了。
If teeth tooth decay before boring to the dental pulp cavity, because root canal treatment technology was not developed teeth almost to escape the pull of fate.
以前如果牙齿蛀牙蛀到牙髓腔，由于当时根管治疗的技术并不发达，牙齿几乎难逃拔掉的命运。
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