Causes of hair fall: Conventional hair colours rely on ammonia, PPD, and hydrogen peroxide (HPO) which weakens the hair's internal protein structure and removes its natural moisture and lipids (Image: Canva)
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Moneycontrol26-02-2026, 13:06

Hair Colouring: Read This Before Your Next Session to Prevent Damage

  • Hair fall after colouring is often breakage, not root loss, due to weakened hair shaft from chemicals.
  • Conventional hair colours use ammonia, PPD, and hydrogen peroxide (HPO) which damage hair's protein structure and remove moisture.
  • Scalp absorbs chemicals efficiently; harsh agents like HPO can cause dryness, allergic reactions, and weaken hair roots.
  • Repeated exposure to HPO, a bleaching agent, creates oxidative damage and chronic dryness, impacting hair follicles and growth.
  • Oxidative damage impairs melanin stability, causing greys to return faster and hair to appear weaker.

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