Unlike bleaches, they don't change the color of teeth.

不同于漂白剂，它们并不改变颜色的牙齿。

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The paper presents the research into the stress state of roller teeth using FEM (finite element method). The results show that different structure parameter causes a change in roll stress.

采用有限单元法对轧辊辊齿的应力状态进行了研究，得出了不同结构参数对轧辊应力变化的影响。

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Based on the thermal elastic mechanics, the influence of temperature change on the normal backlash was analyzed, and the deviation of teeth width was calculated.

本文运用热弹性力学原理，分析了温度变化对啮合齿轮侧隙的影响以及对齿厚偏差选择的影响。

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Many toothpastes on the market claim to have 'whitening' properties - meaning that they may remove stains, rather than change the natural colour of the teeth.

BBC: Whitening toothpastes 'don't work'

Coach Mike Woodson has been prone to let his ball-handlers go into the teeth of the defense when the offense goes awry, and he says a lineup change isn't in the offing.

WSJ: Knicks Should Consider Plan B