 20 citations
,
  July 1988   in “Clinics in dermatology”
           20 citations
,
  July 1988   in “Clinics in dermatology”    Thioglycolate lotions are the most popular method for permanent waving and hair straightening.  
               18 citations
,
  July 2015   in “Journal of cosmetic dermatology”    Straightening and coloring hair, especially with sodium hydroxide, greatly increases protein loss.  
               73 citations
,
  October 2013   in “International Journal of Cosmetic Science”    Chemical hair straightening can damage hair and health, needing safer alternatives and stricter regulations.  
               55 citations
,
  March 2007   in “Journal of cosmetic dermatology”    Afro-ethnic hair can be straightened using chemical and heat methods.  
               23 citations
,
  June 2014   in “International Journal of Cosmetic Science”    Glyoxylic acid is a safer alternative to formaldehyde for hair straightening and effectively changes hair structure.