The jawbone, gums, lips, and soft and hard palates are constantly replenishing themselves throughout life.
颌骨，牙龈，嘴唇和软、硬颚不断的在生活中补充它们自己。
Use a hard bristle toothbrush as this can damage the soft tissues in the gums.
别用硬毛牙刷。硬毛牙刷会伤害牙龈组织。
No matter how hard you try to clean your teeth, there will always be small amounts of food and bacteria under the gums.
不管你如何刷洗牙齿，总会有少量的食物和细菌藏在牙龈底下。
If you brush your teeth too hard, your gums may start to bleed.
如果刷牙时太用力，齿龈就会开始出血。
If you brush your teeth too hard, your gums may start to bleed.
如果刷牙时太用力，齿龈就会开始出血。
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