January 2013 in “프로그램북(구 초록집)” Hair perms or treatments seem safe to use up to 3 to 4 times during pregnancy.
September 2015 in “The European physical journal. E, Soft matter and biological physics/The European physical journal. E, Soft matter” Longer time setting curls overnight leads to better curl retention.
August 2021 in “International Journal of Research in Dermatology” Modern hair straightening improves manageability and strength while maintaining natural waves.
The document concludes that severe trauma can cause temporary hair loss, known as Telogen Effluvium, which usually resolves without treatment.
21 citations,
July 2002 in “Clinical and Experimental Dermatology” Hair care products don't cause hair loss if used correctly.