Periodontal disease showed inflammation of the gums, gum ulcers, necrosis and gums, loose teeth, bleeding gums may appear malignant pain and other symptoms.

牙周病表现为牙龈发炎、牙龈溃疡、牙龈坏死以及牙齿松动，并可出现牙龈出血疼痛和恶变等症状。

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Nearly half of all pregnant women experience gum sensitivity and bleeding when brushing and flossing.

几乎一半的怀孕女性在她们刷牙和用牙线洁牙的时候，会经历牙龈过敏出血。

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The main signs were changes in hand skin and nails, as well as gum bleeding.

体征主要表现为手部皮肤、指甲改变，牙龈出血等。

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And be gentle: If you're too rough, you can cut into the gum and cause bleeding or even a soft-tissue wound over time.

WSJ: How to Be a Better Flosser