Whitening teeth Despite the increase in white, but the results will not meet the expectations of patients.

冷光美白虽然会增加牙齿的亮白度，但效果不会达到患者的预期要求。

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Whitening teeth too often could make them look translucent and blue – so you'll want to maintain your new smile.

美白的牙齿也可以看起来晶莹剔透-让您保持清新靓丽的笑容。

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Whitening teeth will be counterproductive if smoking is continued and should be considered a vital first step in better oral health and a healthier smile.

吸烟会对美白牙齿起反作用，找回健康笑容，美白牙齿至关重要的一步就是不再吸烟。

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Early forms of teeth whitening include using the herb elecampane (Inula helenium) to scrub the teeth and taking sage leaves and making a powder of them and salt.

BBC: Medieval teeth 'better than Baldrick's'

Its LaserSmile system uses a laser to perform soft tissue and cosmetic procedures, including teeth whitening.

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It was fashion and beauty experts who revealed teeth whitening as a business opportunity, not dentists.

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