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]
參考文獻
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