An Ultrastructural Study of Hair Fiber Damage and Restoration Following Treatment with Permanent Hair Dye

February 2002 in “ International Journal of Dermatology ”

Hyung Jin Ahn, Won‐Soo Lee

permanent hair dye p-phenylenediamine m-aminophenol resorcin hydrogen peroxide hair cuticle acidic hair care products cationic surfactants cationic polymers conditioning agents hair shaft restoration hair dye acidic hair products conditioning products

TLDR Permanent hair dye damages hair but it mostly recovers after 8 weeks; using certain hair care products can help repair it.

The study by Ahn and Lee revealed that permanent hair dye containing p-phenylenediamine, m-aminophenol, resorcin, and hydrogen peroxide caused significant damage to the hair cuticle, with the most severe effects seen at 6 hours and 1 day post-application. However, the hair showed a near-complete restoration to its precoloring state after 8 weeks. The findings suggest that an 8-week interval between hair dye applications may prevent cumulative damage, and the use of acidic hair care products and those with cationic surfactants, cationic polymers, and conditioning agents post-dyeing can help in the hair shaft restoration process. The study was conducted on a 26-year-old woman's hair and was partially funded by a research grant from the Pacific R & D Center in Seoul, Korea.

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research An Ultrastructural Study of Hair Fiber Damage and Restoration Following Treatment with Permanent Hair Dye

40 citations, February 2002 in “International Journal of Dermatology”

Permanent hair dye damages hair but it mostly recovers after 8 weeks; using certain hair care products can help repair it.