Hair straightening treatments, also known as hair smoothing treatments, typically contain a variety of active ingredients that help to break down the bonds in the hair's structure, allowing it to be re-shaped into a straighter form. Some of the most common ingredients used in hair straightening treatments include:
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Keratin: A protein that is naturally found in hair, skin, and nails. It helps to strengthen and protect the hair while also smoothing the cuticle.
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Formaldehyde or Formaldehyde-releasing agents: A strong chemical that can break down the bonds in the hair's structure, allowing it to be straightened. However, formaldehyde has been linked to health concerns, so many hair smoothing treatments now use formaldehyde-releasing agents that produce lower levels of formaldehyde. Brazilian Blowout uses Methylene glycol that is a Formaldehyde-releasing agent.
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Glyoxylic Acid: A type of alpha hydroxy acid that helps to smooth the hair cuticle and reduce frizz.
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Thiourea Dioxide: A reducing agent that helps to break down the bonds in the hair's structure.
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Calcium Hydroxide: A strong alkaline ingredient that helps to open up the hair cuticle, allowing it to be straightened.
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Guanidine Carbonate: A strong alkaline ingredient that helps to break down the bonds in the hair's structure.
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Ammonium Thioglycolate: A reducing agent that helps to break down the bonds in the hair's structure.
These are just a few examples of the ingredients that may be used in hair straightening treatments. It's important to note that different hair smoothing treatments may contain different combinations and concentrations of ingredients, so it's always a good idea to check the product label and consult a stylist or hair care professional before undergoing a treatment.