Hair coloring and bleaching can permanently break down hair protein and temporarily change its properties.
39 citations,
June 2019 in “Nanomaterials” Nanotube-based hair treatments could improve hair health and growth, and offer long-lasting effects.
1 citations,
December 2022 in “Middle East Journal of Science” Permanent hair dyes use chemicals that react with hydrogen peroxide to create color.
February 2021 in “Journal of the Korean Society of Cosmetology” Castor oil improves the texture of bleached hair by increasing its strength.
1 citations,
March 2005 in “International Journal of Cosmetic Science” Twisting hair weakens it, but strength can be recovered at low twist levels.