Colouring changes the colour, but it also damages the cuticle, and bleaching most of all: it destroys part of the hair's structure. Hence the dryness, porosity and brittleness of dyed hair. You do not have to give it up — but care and a regime matter. Let us work out how to protect the colour and the hair.
Colouring and especially bleaching lift and damage the cuticle, making the hair dry, porous and brittle. Care: more time between colourings (in the dry season 8–10 weeks and longer), a gentle shampoo for coloured hair, a hydrating and leave-in conditioner, less heat, heat protection. Home bleaching and "complex" procedures are better done by a professional — this is a common source of serious breakage.
01What dye and bleach do
To change the colour, the formula opens the cuticle and acts on the pigment inside. Toning and gentle colouring damage moderately; bleaching (lightening) most of all, because it destroys part of the shaft's structure to wash out the pigment. The result: the hair becomes more porous, dry and brittle, holds moisture worse and splits more easily. The lighter you go from your own colour — the greater the load on the hair.
02Less often means gentler
One of the most underrated pieces of advice from dermatologists is to increase the gap between colourings and root touch-ups. In the dry season, try to stretch it to 8–10 weeks and longer. The less frequent the chemical treatment, the less the accumulated damage. Combining colouring, bleaching and perming/straightening in a short span is especially risky — it is a cumulative blow to the shaft.
03How to care for the colour
Basic care for dyed hair: a gentle shampoo, specially for coloured hair (washing less often helps the colour last longer), an essential hydrating conditioner after every wash and a leave-in conditioner — they reduce the breakage and splitting of porous hair, deep masks on the length, heat protection and minimal heat. Home bleaching, chemical straightening and "complex" techniques are better entrusted to a salon, where they will assess the state of the hair and choose the formula — that way there is less risk of "burning" the hair.
- Home bleaching over the whole length. A common source of heavy breakage — better to a pro.
- Frequent root touch-ups. Stretch the gap, especially in the dry season.
- Colouring + bleaching + chemistry in a row. A cumulative blow to the shaft.
- Skipping conditioner and masks. Porous dyed hair especially needs moisture.
- Hot styling without heat protection over dye. Adds to the chemical damage.
04What to try
Cleansing and colour
Hydration of porous hair
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05Common questions
Does bleaching always ruin the hair?
It always damages the structure more than ordinary colouring, because it destroys part of the shaft. Professional execution, care and time between procedures help reduce the damage.
How often can I colour my hair?
The less often, the gentler. Dermatologists advise stretching the gap between colourings and root touch-ups — in the dry season to 8–10 weeks and longer.
Can I bleach at home?
You can, but it is a common source of serious breakage. Bleaching and "complex" techniques are safer done by a professional, who will assess the state of the hair and choose the formula.
Drawing on dermatological sources:
- 10 hair care habits that can damage your hair — colouring/chemistry, a gap of 8–10 weeks. AAD.
- Hair loss: Tips for managing — a gentle shampoo and hydrating conditioner for fragile hair, home colouring/chemistry — to a pro. AAD.
- Tips for healthy hair — a shampoo for your hair type, including for coloured; protection from heat. AAD.
This material is educational and does not replace a consultation with a dermatologist or a professional hairdresser.