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怎样识别牙膏的真假
更新时间： 2020-07-06 00:00:00  

看牙膏的稀稠度。如果挤时费力或特别稀湿，导致不成圆状，说明质量已经发生变化。看牙膏的色泽。色泽应该洁白，叶绿素牙膏应呈淡绿色。如果出现黑色，可能是铅质软管内壁的锡层不匀或太薄，挤压时膏体接触了铅层。变黑的牙膏含有铅质，对人体有害，用久会慢性中毒。看牙膏里有无过硬的颗粒。将少许牙膏涂抹在玻璃上，用手指摊均按压，看有无过硬的颗粒。如有会在刷牙时划伤牙。看牙膏有无渗水现象。挤点牙膏放在毛边纸上，用手指均匀摊开，看纸的反面有无渗水。质量好的牙膏渗水很少。看牙膏管体。软管要挺直，管尾电焊的齿

关键词： 怎样 识别 牙膏 真假

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