18 citations
,
  July 2015   in “Journal of cosmetic dermatology”    Straightening and coloring hair, especially with sodium hydroxide, greatly increases protein loss.  
               November 2022   in “International journal of trichology”    Glyoxylic acid straighteners cause more protein loss but have similar hair strength effects as traditional alkaline straighteners.  
      2 citations
,
  May 2002   in “Clinics in Dermatology”
           2 citations
,
  May 2002   in “Clinics in Dermatology”    Ethnic differences in hair and skin are significant and under-researched, requiring tailored dermatologic treatments and more study.  
      March 2010   in “Cosmetic Dermatology”
           March 2010   in “Cosmetic Dermatology”    Hair straightening methods have advanced to improve effectiveness and reduce damage, but still rely on heat and chemicals.  
      4 citations
,
  January 2021   in “Skin appendage disorders”
           4 citations
,
  January 2021   in “Skin appendage disorders”    Hair straightening can damage hair and pose health risks, including exposure to carcinogens and hair loss.