“明眸皓齿”历来是评价一个人是否美丽的一条不可缺少的标准,还在一定程度上反映一个人的文明程度。基于广大消费者想美化牙齿的渴望,大连信伟公司开发研制出的司美尔(Smi le)牙齿美白粉,就是专为清除吸烟、喝茶、饮咖啡等引起的黄牙或黑牙的一种高科技产品。一、牙齿为什么会变色正常牙齿牙冠表层的牙釉质呈乳白色而略显透明,其下面的牙本质呈淡黄色,所以看上去牙齿呈乳白色或略显黄色。那么,为什么有的人牙 “Bright eyes white teeth” has always been an evaluation of a person’s beauty is an indispensable standard, but also to some extent, reflects the degree of a person’s civilization. Based on the desire of consumers to beautify their teeth, Smilar tooth whitening agent developed by Dalian Xinwei Company is designed to remove yellow teeth or black teeth caused by smoking, drinking tea, drinking coffee, etc. High-tech products. First, why the teeth will change color Normal teeth crown surface enamel was milky white and slightly transparent, the following dentin was pale yellow, so it looks milky white or slightly yellow teeth. So, why do some people teeth