Keratin straightening: what to check beyond smooth hair
A treatment's name does not reveal the product's ingredients. Before straightening, check the substances used, the process and the risks.
Start with the product name, not the treatment name
The term keratin straightening describes a salon service, but does not list everything in the bottle. Two treatments with similar names may use different products. Before booking, ask for the exact trade name, manufacturer and ingredient list. A photograph of shiny hair says nothing about product safety, and the words natural or organic are no substitute for checking. If clear information is not provided, you can postpone the decision without committing to treatment. Ask to see the original packaging before application and confirm that its name matches the product discussed when you booked, rather than a substitute.
Why heating matters
Some hair-straightening products contain formaldehyde or substances that can release it during use and heating. The US Food and Drug Administration, FDA, warns that exposure can cause effects including eye and respiratory irritation, headaches and skin reactions. Ingredient lists may also use the names formalin or methylene glycol. This does not mean every straightening treatment contains the same substance, but neither should you assume the name keratin rules it out. Check the composition of the product that will actually be used.
A formaldehyde-free claim also needs checking
The US Occupational Safety and Health Administration, OSHA, has previously documented formaldehyde exposure even with products labelled formaldehyde-free. Ask the salon whether a safety data sheet and manufacturer instructions are available, and how staff handle fumes during treatment. This information also concerns workers' health, as they are exposed to these services throughout the day. An open window or a promise that there is no noticeable smell does not prove there is no exposure, and ventilation alone does not make a problematic product safe.
The warning relevant in Israel
Israel's Ministry of Health has warned about straightening products containing glyoxylic acid after a link was found between their use and kidney injury. Its notices clarify that the ingredient is prohibited in cosmetics intended for hair straightening in Israel. The absence of formaldehyde therefore does not end the checks: other ingredients and warnings concerning the particular product also need examination. Check product details in Ministry of Health sources before treatment, rather than relying solely on a foreign label or the seller's assurances.
A brief conversation before starting
Tell the stylist about previous straightening, bleaching and other treatments, and ask what the process involves and how to care for your hair afterwards. Clarify any limitations given your hair's condition, rather than accepting a promise of a result identical to a photograph. If unusual burning, coughing or feeling unwell occurs during treatment, ask to stop and obtain an appropriate assessment; breathing difficulties or a significant reaction require urgent medical care. Keep a photograph of the packaging and ingredients so you can provide accurate information. The decision to have straightening should rest on an identified product and an understanding of the process, rather than pressure to take up a same-day offer.
