TS最近严重被这个问题困扰。

我一般情况下都是两天洗头一次，心里总是觉得每天洗头对头发不好。之前也一直尽量保持两天洗头一次，除非出差的时候需要进锅炉房，里面灰尘大而且温度高。这种情况我就会每天洗头。可以最近我每天晚上头发都是油油的，如果不洗发第二天上班都觉得特别不舒服。而且隔天洗头发，除了特别油之外，掉头发也特别严重，还有就是觉得头皮都粘粘的。。。所以只能天天都洗头发了。。

我搜索了一下网络，研究了一下每天洗发对头发的伤害。还真是各说纷云啊。国内大部分都是不建议每天洗头发。各种负面的影响啊。

我又好奇的搜索了一下英文网页，很多时候毕竟国外和国内想法不一样嘛。。

比如下图：

大致的意思就是天天洗发没有害处，而且如果你是以下三种人，建议是每天都洗。1）锻炼时候出汗 ， 2）使用啫喱或者发蜡的  3）使用发胶等接触头皮的

最后我找了一个我觉得比较不错的和大家分享一下：

根据你的发质决定洗发频率

1. Dry or Curly Hair （干性或者卷发）

If you have dry and/orcurly hair, you lucky lady, you don't have to wash your hair every day and quite frankly, you shouldn't (it's very likely you know this already). A basic rule of thumb for you is to shampoo twice a week with moisturizing shampoo and conditioner.

你非常幸运，不用每天洗发，建议一周两次，用保湿的洗发水和护发素

2. Normal Hair （正常的／普通／中性？）

If you have normal hair (and I know of no one who thinks they have normal hair ), you can wash your hair up to five times a week or as needed. You might find you need to wash hair more times in summer when you're more active (unless you're a skiing fanatic, in which case I say just wear a hat).

建议一周最多五次，夏天活动多的话 可以增加次数

3. Oily Hair （油性，我就是油性）

For those of us with oily hair (me, me!), contrary to wisdom you may have read in Seventeen magazine in your youth, you can wash hair daily. You've probably heard that if you can make it a few days, your oily hair actually stops looking oily. While some women I know have tried this and swear that by day 5 their hair finally normalized, when I tried it, my hair resembled the inside of a deep fat fryer.

Skipping a few days is not going to magically turn your limp locks into full body wonder.

If you do want to attempt to go more than a couple days without shampooing your hair, try a dry shampoo. They are formulated to soak up oils, buying you a day or two between shampoos. You can also sprinkle baby powder on your crown to soak up the oils (oh how I love that trick).

可以每天都洗。有些人听说五天不洗，头发就不再出油。试过之后成功了。可是文章的作者试过之后，觉得像是油锅

Is It Safe to Wash Oily Hair Daily? （油性发质每天洗安全吗？）

Most experts agree that it's safe to wash hair daily with a mild shampoo. Concentrate on washing the roots because it's your scalp that's oily, not your hair, according to beauty expert Mitchell Barnes in  Real Simple magazine.

大部分专家认为是安全的 － 使用温和的洗发水。洗头发的根部，因为主要是头皮出油。

Always use conditioner, even on oily hair, just leave the conditioner to the bottom two-thirds of hair. Conditioner on roots will only help weigh hair down more. Not shampooing daily can leave hair limp, however, so I suggest sprinkling a bit of talcum powder along the roots and crown or using a dry shampoo like one of these popular ones in my list.

If you insist on washing daily, try this trick I got from Harper's Bazaar a few years ago: Apply conditioner first only to the bottom third of hair (if you have oily hair, don't use conditioner on the roots, it will weigh hair down). Keeping the conditioner in, apply shampoo to the roots and lather up. Rinse everything off. "Your roots will be lifted, but the rest of your hair will retain its shine," says Arsen Gurgov, a stylist at Louis Licari salon and the originator of this great tip.

不翻译了 大致的意思就是 护发素尽量不要用再头发跟，头皮的地方，要用在头发尾部。（我一般就是用在耳朵以下的发尾）