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How Does Hair Dye Kill Lice?

Many people ask this question: does hair dye kill lice? This is a serious question because it can lead to serious consequences if the answer is “yes”. If you are not careful, hair color can become a route for diseases such as hepatitis and HIV. Some people do not realize that there are problems with color in general and using hair products that contain chemicals could be one of them. This article will explain: How does hair dye kill lice? If yes, how?

How Does Hair Dye Kill Lice?

Hair dyes kill lice and nits contain bleach. While bleach does its job of killing the nits and the eggs, it also leaves behind on your scalp a hard shell, or outer layer, that keeps future infestations from developing. Over time, this layer becomes slightly toxic. When you wash your hair after using hair dye, you wash away the protective layer and your hair end up with some dark spots that are similar to dandruff. However, there are ways to reduce the toxicity or kill off the hard shell.

Hair dyes have two main ingredients: ammonia and hydrogen peroxide. Ammonia is typically used to make the hair lighter, and although it is also an alkali, it does not cause skin irritation or allergic reactions. Lice cannot stand an environment on your scalp that is too alkaline, so soon enough, they will most likely die. But don’t get too excited yet. Some hair dyes contain ammonia as an ingredient, but it isn’t really an effective alkali.

The Advice to Does Hair Dye Kill Lice

If you plan to wash your hair to get lice and nits off, be sure that you only use water. Using a shampoo with high levels of alkali or chlorine may aggravate the problem. Also, keep in mind that you should never let your hair become too dry. Always pat your hair dry instead of rubbing it dry or using heat to speed up the drying process. This allows the alkali in your shampoo to work better with your hair shaft.

Another issue that may come up if you use hair dye to kill lice is that there is some residue that remains on your scalp. It’s not clear how much residue is left, but you can usually spot it. It’s a waxy substance that looks like a crayon. If you see any white residue on your scalp after you wash it, you may want to wait 24 hours before shampooing it again. If the residue doesn’t seem to go away, you may want to use a conditioner to help seal in some of the product.

When looking at the question does hair dye kill lice, it is important to first look into the various types of treatments available and how they work. The most popular ones today work like this: put some nit comb on the hair and gently pull the hair until only the very tip of the louse remains, then remove the comb. Lice eggs will hatch within two days. Fortunately, these lice treatment solutions are fast acting and the lice will be gone from the hair in just a few hours. They will grow back just as quickly, but will probably be shiner than before.


Although hair dye may not kill lice and nits on its own, there are a few home remedies that you can try to eliminate the problem. Using lemon juice mixed with salt is a great way to kill lice and mites on your hair shaft. Lemon juice contains natural bleaching properties that will help lift color molecules from the shaft and cause them to be evaporated. You can also make your own apple cider vinegar solution that will help kill lice as well as killing them on contact.

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