Acid attacks can happen as a result of plaque bacteria acting on the sugars in our diet, or as a direct result of the acids in food dissolving away the enamel on the surfaces of our teeth.

酸袭击可能发生，由于牙菌斑的细菌作用于我们饮食中的糖，或作为一个直接结果，酸溶解食物上溶掉了在我们牙齿表面上的珐琅。

youdao

To clean the biting or chewing surfaces of the teeth, hold the brush so the bristles are straight down on those surfaces.

为了清洁牙齿切端或咬合面(咀嚼食物的那一面)握牙刷是刷毛与这些面垂直。

youdao

Other so-called suckermouth armored catfish species use their unique teeth to scrape organic material from the surfaces of submerged wood.

科学家在以往对其它种类胡子鲶鱼进行的研究中发现，它们通常使用造型独特的牙齿从沉入水底的树木表面刮取有机物充饥。

youdao

The report says scientific evidence suggests "almost every proven method to prevent decay includes delivery of fluoride to teeth surfaces".

BBC: Tooth decay in children too high, says chief dental officer

So while mouth washes are great for killing remnant bacteria on all surfaces, you have to get between the teeth with the ancient invention called floss to really reach every spot.

WSJ: How to Be a Better Flosser

Thus there are few broken lines to parallel the cratered surfaces and broken-off noses and limbs of the sculpture, not even lines or tones showing the teeth or grain of paper.

FORBES: Seeking The Perfect Summer Art Cocktail