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What chemical is used in Japanese hair straightening?


Japanese hair straightening, also known as thermal reconditioning or Yuko system, is a popular hair treatment that originated in Japan in the early 1990s. This process permanently straightens curly or wavy hair by breaking down and restructuring the hair’s protein bonds. One of the key components of this treatment is the use of a specific chemical solution that softens and breaks down the hair’s natural structure. In this article, we will explore the chemical used in Japanese hair straightening and its effects on the hair.

The Chemical Used in Japanese Hair Straightening

The chemical used in Japanese hair straightening is generally a combination of two solutions: a relaxer and a neutralizer. The relaxer is typically made up of sodium hydroxide or guanidine hydroxide, which are strong alkaline substances that break down the protein bonds in the hair shaft. The neutralizer is usually made up of hydrogen peroxide, which restores the pH balance of the hair and helps to reform its protein bonds in a straighter configuration.

Japanese Snack Box

How Does the Chemical Work?

The chemical used in Japanese hair straightening works by penetrating the hair shaft and breaking down its protein bonds. This process makes the hair more pliable and allows it to be reshaped into a straighter form. Once the hair has been sufficiently relaxed, it is rinsed thoroughly to remove any excess chemicals. The neutralizer is then applied to fix the new shape of the hair and restore its natural pH balance.

Side Effects of Japanese Hair Straightening

While Japanese hair straightening can produce beautiful results, it is important to be aware of its potential side effects. The chemical solution used in this treatment can be harsh on the hair, and can cause damage, breakage, and dryness. In addition, some people may experience scalp irritation or allergic reactions to the chemicals used in the process.

Alternatives to Japanese Hair Straightening

If you are wary of the potential side effects of Japanese hair straightening, there are several alternatives that may be worth considering. One option is keratin treatment, which involves applying a protein-based solution to the hair to smooth and straighten it. Another option is the use of flat irons or other styling tools to achieve a straighter look without the use of chemicals.

Choosing a Japanese Hair Straightening Salon

If you decide to go ahead with Japanese hair straightening, it is important to choose a reputable salon with experienced professionals who are knowledgeable about the process. Look for salons that use high-quality products and have positive reviews from past clients.

Preparing for Japanese Hair Straightening

Before undergoing Japanese hair straightening, it is important to prepare your hair by avoiding any chemical treatments or heat styling for at least two weeks prior to your appointment. This will help to minimize any potential damage or breakage during the process.

The Process of Japanese Hair Straightening

The process of Japanese hair straightening typically takes several hours and involves several steps. After preparing the hair, the relaxer solution is applied section by section, starting at the roots and working down to the ends. Once the hair has been relaxed, it is rinsed thoroughly and blow-dried straight. The neutralizer solution is then applied, and the hair is rinsed again before being blow-dried and styled.

Caring for Your Hair After Japanese Hair Straightening

After undergoing Japanese hair straightening, it is important to take good care of your hair to maintain its health and appearance. This includes using gentle shampoos and conditioners, avoiding heat styling as much as possible, and getting regular trims to prevent split ends.

The Cost of Japanese Hair Straightening

The cost of Japanese hair straightening can vary depending on a number of factors, including the length and thickness of your hair, the salon you choose, and your location. On average, you can expect to pay several hundred dollars for this treatment.


Japanese hair straightening is a popular hair treatment that can produce beautiful results for those with curly or wavy hair. While this process involves the use of strong chemicals that can be harsh on the hair, it can be a great option for those who want a permanent solution to their hair texture. By understanding the chemical used in Japanese hair straightening and taking good care of your hair after the process, you can enjoy smooth, straight locks for months to come.

What chemicals are in Japanese straightening?

Relaxers or Japanese straightening are more long-lasting methods of straightening hair that use ammonium thioglycolate and sodium hydroxide to break down the hair bonds.

Does Japanese hair straightening contain formaldehyde?

The Japanese Hair Straightening process is a permanent method of straightening hair that results in smoother, shinier strands without any frizz. The thermal reconditioning system used in this treatment is free from formaldehyde and doesn’t cause any harm to your hair.

What product is used for Japanese hair straightening?

YUKO Hair Straightening is a patented hair straightening system that is widely known around the world as “Japanese Hair Straightening” or “Thermal Reconditioning.”

What is the Japanese secret to straight hair?

Japanese hair straightening involves using a particular solution, which is similar to a flat perm, on the hair. This solution breaks down the bonds within the hair that provide it with shape, which then allows the hair to become perfectly straight when it is straightened with a flat-iron.

What is the healthiest chemical straightening?

When it comes to hair treatments, hair botox is considered the safest option for deep treatment. Unlike other treatments that may contain harmful chemicals, hair botox does not have formaldehyde or other harsh chemicals that can cause damage to the hair.

What is the safest straightening treatment?

The Brazilian Straightening treatment, also known as Keratin Treatment, is considered to be a safer method for straightening hair. Keratin, a protein that is naturally present in our hair, decreases with age and unhealthy eating habits, leading to weaker hair. This treatment helps replenish these levels of keratin to promote healthier, straighter hair.

It is important to note that Japanese hair straightening is not suitable for everyone. Those with very fine or damaged hair may not be good candidates for this treatment, as the chemicals used can cause further damage and breakage. Additionally, it is important to choose a reputable salon and experienced professionals to perform the treatment, as improper application of the chemicals can lead to serious damage.

Another thing to consider before undergoing Japanese hair straightening is the maintenance required to keep your hair looking its best. While this treatment does provide a permanent solution to curly or wavy hair, it does not prevent new hair growth from coming in with its natural texture. This means that regular touch-ups may be necessary to maintain the straightened look.

It is also important to note that Japanese hair straightening can alter the color and texture of your hair. The chemical process can cause color fading, and may result in a slightly different texture than your natural hair. It is recommended to discuss any concerns or questions with your stylist before undergoing the treatment.

Overall, Japanese hair straightening can be a great option for those looking for a permanent solution to their curly or wavy hair. However, it is important to weigh the potential risks and side effects before deciding if this treatment is right for you. By choosing a reputable salon and taking good care of your hair after the process, you can enjoy beautiful, straight locks for months to come.

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