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A permanent wave, commonly called a perm or permanent (sometimes called a "curly perm" to distinguish it from a "straight perm"), [1] is a hairstyle consisting of waves or curls set into the hair. The curls may last a number of months, hence the name. Perms may be applied using thermal or chemical means.
The thioglycolic acid in the perm solution reduces the disulfide cystine bonds in the cortex of the hair. [2] In a sense, the thioglycolate removes crosslinks. After washing, the hair is treated with a mild solution of hydrogen peroxide , which oxidizes the cysteines back to cystine .
Another type of "no-lye" relaxer uses ammonium thioglycolate, which is also known as perm salt for its use in permanent waves. Perm salt is a chemical reducing agent which selectively weakens the hair's cystine bonds instead of disrupting the entire protein, but strips out the natural oils even more thoroughly than the alkali hydroxide products.
The curl-perm process adds body and volume to flat or straight hair, giving it more volume and making it easier to style. More specifically, it depends on your hair texture and what you’ve done ...
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Dread perms usually cost in the range of $300–$400 at a salon, and although pricey, often prove to be the easiest and most professional way of creating dreadlocks. Another option is to buy a home-perm kit, as these will only cost $10–$20, with a similar, if not better result.
"Perming" is time and labor-intensive, and expensive to maintain. The chemicals required for the process often cause the wearer's natural hair to become brittle and dry. To maintain the look of the Jheri curl, wearers are required to apply a curl activator spray and moisturizers daily, and sleep with a plastic cap over the hair to prevent it ...
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