January 2013 in “프로그램북(구 초록집)” Hair perms or treatments seem safe to use up to 3 to 4 times during pregnancy.
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July 2016 in “Cosmetics” Future hair cosmetics will be safer and more effective.
September 2020 in “Benha Journal of Applied Sciences” Protein hair straighteners damage the hair more than hair dyes.
February 2022 in “Cosmetic Dermatology” Permanent hair waving uses chemicals to create long-lasting curls.
December 2000 in “Kirk-Othmer Encyclopedia of Chemical Technology” Hair care products are regulated, with shampoos, conditioners, dyes, and styling products designed for cleaning, enhancing, and maintaining hair.