When not removed, plaque causes tooth decay and gum disease.

牙斑没有清除就会导致蛀牙和牙龈疾病。

《柯林斯英汉双解大词典》

The result is tooth decay and gum disease.

后果就是产生蛀牙和牙龈疾病。

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Sugarless yogurt could help beat bad breath, tooth decay and gum disease.

无糖酸奶有助于缓解口腔异味、蛀牙和牙龈疾病。

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And removal is called for in cases where fluid collects around a wisdom tooth that is partly or fully below the gum.

VOA: special.2011.08.10

And your friend is telling you, "You know, I've been chewing this gum and it tastes really good."

你的朋友告诉你，“我一直在嚼这种口香糖，它吃起来棒极了。”

I've been 课堂 - SpeakingMax英语口语达人

"This is a gum ball, same shape and size, poses the same threat to a child's airway.

VOA: standard.2010.02.23

Wrigley's Mr Kehoe says the next target for gum is gingivitis and gum disease.

ECONOMIST: Medical confectionery

That means its dentists often treat bone loss and gum disease and install a lot of false teeth.

FORBES: Magazine Article

Tooth decay and gum disease are major public health problems, associated with poor digestion, heart attacks, strokes and cancers, stemming from inflammation and subsequent infections.

MSN: Let Kids Gorge on Halloween Candy, Dentists Say