October 2015 in “Cosmetic Dermatology” Hair straightening changes hair structure and can cause damage if done wrong, but improvements in the methods are expected to continue.
Hair coloring and bleaching can permanently break down hair protein and temporarily change its properties.
August 2023 in “Journal of Student Research” Human hair keratin mixed with rubber slightly improves its strength and biodegradability.
Alkylating agents can kill cancer cells but may cause skin and allergic reactions.
March 2010 in “Cosmetic Dermatology” Hair straightening methods have advanced to improve effectiveness and reduce damage, but still rely on heat and chemicals.