洗頭是一種美髮行為,是指人們通過清洗頭髮來保持頭髮清潔。為了去除頭髮上的皮脂和污垢,有些人在頭髮上塗抹表面活性劑(通常是洗髮水以及肥皂)並用手抓頭髮,然後用水沖洗。隨後表面活性劑與它所結合的頭髮污垢會一起被水沖洗掉。[1]
![Thumb](http://upload.wikimedia.org/wikipedia/commons/thumb/3/3c/Zulu_Land_-_washing.jpg/640px-Zulu_Land_-_washing.jpg)
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