The tooth enamel is softened by the acid and brushing straight after will wear the teeth down.

酸性物质会软化牙釉质，立即刷牙会磨损牙齿。

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Likely cause: Known as bruxism, teeth-grinding varies from jaw clenching to ferocious grinding that wears teeth down to stumps. It is usually due to genetics or stress.

可能的诱发原因：虽说都叫磨牙症，但磨牙的情况各不相同，从牙关紧闭到疯狂磨牙直到牙齿只剩残根。磨牙通常是由遗传或压力造成的。

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Poor tooth brushing techniques can harm your teeth - if you really scrub your teeth too hard, you will wear the sides of your teeth down, leaving V-shaped defects near the gum margins.

不恰当的刷牙方法会损害牙齿，如果你真的太用力刷牙，就会磨损牙齿边缘，在牙龈缘附近形成V字形缺口。

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As he once told the Washington Post: "When I came down I hurt my teeth in the net."

VOA: special.2010.07.05

Here's one climbing out of the pool: First her face appeared, long and cadaverous, with a bandage-like bathing cap coming down almost to her eyes, and sharp teeth protruding from her mouth.

有一个女人从游泳池中出来了，首先是她的脸，修长,而惨白，如绷带般的泳帽从她的头部,耷拉到她的眼睛，锋利的牙齿从她的口中突出。

耶鲁公开课 - 1945年后的美国小说课程节选

The suction, along with the abrasive nature of salt water, wears their teeth down.

BBC: Earth News - Massive killer whale pod sighted

The killer whales that feed on mackerel have been found to have very worn down teeth as a result of their feeding behaviour.

BBC: Earth News - Massive killer whale pod sighted

And enough carbon dioxide emissions to spur the anti-coal crew to gnash their teeth all the way down to the gums.

FORBES: Peabody Earnings Up, Coal Supercycle Just Beginning