How often should you dye your hair, and is it true that more expensive hair dyes are better, given that many people tend to buy costly dyes in hopes of better results?
Changing hair color can provide a youthful and stylish appearance for everyone. However, due to concerns about the potential harms of hair dye, many opt for expensive products based on the belief that “you get what you pay for.” Is this notion accurate?
Is More Expensive Hair Dye Better?
Dr. Zhong Hua, a dermatologist at the Military Medical University in China, states that most hair dyes contain hydrogen peroxide and amphetamine.
As such, whether cheap or expensive, there is very little difference in effectiveness and safety when dyeing hair.
The advantages of pricier hair dyes may include different formulations and a slightly better experience, such as less frizz after dyeing or a lack of unpleasant odors during the process. However, expensive hair dyes do not have absolute advantages, meaning that higher prices do not necessarily equate to better quality.
Ultimately, individuals should choose based on personal needs and hair type, while ensuring they follow usage instructions to minimize potential risks.
Expensive hair dyes do not have absolute advantages, meaning that higher prices do not necessarily equate to better quality. (Illustrative image).
Can Hair Dye Cause Allergies?
Many people use hair dye without experiencing any issues. However, some individuals may suffer from skin irritation or allergic reactions to the dye.
Dr. Jody A. Levine, a dermatologist based in New York City, explains: “Most skin irritations or allergic reactions caused by hair dye are due to interactions with PPD.” Studies show that just over 6% of people with dermatitis in North America are allergic to PPD.
Dr. Levine points out that other hair dye ingredients, such as ammonia, sulfates, parabens, fragrances, and formaldehyde, can also trigger skin reactions.
The most common skin reaction to hair dye is contact dermatitis – a condition triggered by contact with a substance to which the body is sensitive. Levine explains: “With contact dermatitis, one may notice skin discoloration, itching, and swelling. In severe cases, scaling may also occur.”
These symptoms typically manifest on the scalp, face, and neck, as these areas are most likely to come into contact with the dye. “However, if gloves are not used when applying the dye, the person dyeing their hair may also experience these symptoms on their hands,” Levine adds.
Additionally, when the skin barrier is compromised, hair dye can easily penetrate and irritate the skin. For example, conditions like eczema can lead to tiny cracks on the skin’s surface, making it more susceptible to irritation from hair dye ingredients.
Similarly, components in hair dye can exacerbate scalp psoriasis, a condition where thick, raised patches develop on the scalp.
However, skin issues are not the only concerns when dyeing hair. “Eyes can become irritated if they come into contact with the product. Moreover, fumes from hair dye containing certain ingredients, such as ammonia or formaldehyde, may cause respiratory issues,” Levine warns.
The most common skin reaction to hair dye is contact dermatitis. (Illustrative image).
Things to Consider for Safe Hair Dyeing
Professor Yang X Xuan, a dermatologist at the Southwest Hospital of the Military Medical University in China, advises that when using hair dye, one must pay attention to three major risks: allergies, hair damage, and heavy metal poisoning.
Some low-quality hair dyes may even contain heavy metals that exceed safety standards. Prolonged use of such products can lead to heavy metal poisoning.
Furthermore, even standard products should not be taken lightly during the dyeing process, particularly regarding two key considerations:
Frequency of Hair Dyeing
Dyeing at home is indeed convenient, and many people often experiment with different hairstyles and colors.
However, Dr. Yang Shuxia, head of the Dermatology Department at Peking University First Hospital, shares that frequent hair dyeing can make hair more prone to breakage and damage while causing a loss of shine and increased frizz. It is advisable not to dye hair more than twice a year to keep it healthy.
Groups That Should Avoid Hair Dyeing
Dr. Chu Yuhao from Beijing University of Chemical Technology and an engineer at the Sinopec Beijing Chemical Industry Research Institute recommends that individuals with sensitive scalps, damaged skin, pregnant or breastfeeding women, the elderly, and those with impaired liver or kidney function should avoid hair dyeing to prevent the accumulation of harmful substances in the body, which could affect health.
In particular, products marketed as “one-time rinse” that promise desired hair color may pose more risks than regular hair dyes. High-frequency use can increase the risk of allergies and bodily harm.
