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怎样知道牙膏质量好与不好
更新时间: 2020-07-06 00:00:00  

分辨牙膏质量好坏有几种方法:

1、观察是否渗水。挤一滴牙膏放在卫生纸上,用手指把他均匀地摊开,看卫生纸的背面是否有水。质量好的牙膏是不会渗水的或者几乎不渗水,相反,质量差的牙膏会渗水;

2、看稀稠程度。质量好的牙膏能挤成条状,不费力,稀稠适宜。而质量不好的或者变质的牙膏挤不成条状或者挤得很费力;

3、闻气味:好的牙膏闻起来有一股自然的清香味道,而不好的牙膏则会有股淡淡化学药品的味道,尤其是在刷牙的时候最明显;

4、是否有不溶颗粒物。好的牙膏中不会有不溶

关键词: 怎样 知道 牙膏 质量 不好

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