Hair coloring and bleaching can permanently break down hair protein and temporarily change its properties.
January 2026 in “International Journal of Biological Macromolecules” Small KP peptide improves hair without reducing agents, while larger proteins need them for better results.
Chemical treatments weaken hair's thermal stability and structure.
Oxidized hair can naturally regain strength and stability over six months.
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January 2011 Relaxers straighten African hair by breaking down its helical structure using strong bases.