Quick answer: a lightweight hair oil helps bleached hair by smoothing the rough, lifted cuticle, adding shine and slip, and reducing friction, so lightened hair looks healthier and snaps less when you brush or style it. Use a few drops on the mid-lengths and ends, on damp or dry hair, and keep it off the roots. Oil can't repair the damage bleach does inside the hair, so pair it with a strengthening routine and always use heat protection.
What bleach does to your hair
Bleach lightens hair by opening the cuticle and breaking down the pigment inside the strand. That leaves hair:
- Porous: it soaks up water quickly and loses moisture just as fast, so it feels dry and frizzy.
- Rough: a lifted cuticle catches light badly and tangles easily, so hair looks dull.
- Weaker: the inner structure is damaged, so hair can stretch, snap and split.
Read more in our guide to hair porosity.
Does hair oil help bleached hair?
Yes, with limits. A good oil coats the surface of the strand, smoothing the cuticle, sealing in moisture and adding slip. That means more shine, less frizz and less breakage from brushing. What an oil can't do is rebuild the inner structure that bleach has broken down: hair isn't living tissue, so no oil can permanently repair it. For that, bleached hair needs strengthening care as well.
Which hair oil is best for bleached hair?
Choose a lightweight oil. Lightened hair is often fine and porous, and heavy oils can leave it limp, greasy or even dull. From our range:
- For softness and shine on dry lengths: Illuminating Hair Oil-Serum, a blend of rice bran, sweet almond and argan oils with organic coconut, chia and sacha inchi that smooths lengths and tames flyaways without greasiness.
- For frizz and a glossy finish: Liquid Crystals, our award-winning shine serum with organic sesame and linseed oils, voted Best Serum at the HAIR Awards 2022.
- If oils feel too heavy: Oil Non Oil, an anti-frizz fluid with the smoothness of an oil and none of the weight, ideal for fine blonde hair.
- For bleached waves and curls: Bouncy Curls Hair Oil, light enough for all curl types.
How to use hair oil on bleached hair
- Start small: one or two drops for fine hair, a little more for thick hair. You can always add more.
- Warm it between your palms and smooth it over the mid-lengths and ends, where hair is most damaged.
- On damp hair before blow-drying, it adds slip and reduces frizz. On dry hair, it finishes and adds shine.
- Keep it off the roots, which get oily on their own.
- As a pre-wash treatment, apply to dry lengths for 30 minutes to an hour before shampooing.
What else bleached hair needs
- Strength: the Rebuild routine is made for weakened hair. In a cyclic fatigue test on bleached hair, the Rebuild routine (Replenishing Shampoo, Replenishing Conditioner and Thermal Care Serum) helped hair withstand more breakage cycles than untreated hair.
- Heat protection: bleached hair is especially vulnerable to heat. Replenishing Thermal Care Serum protects up to 230°C. See our heat protectant guide.
- A weekly mask: see how to choose a hair mask.
- Toning: to keep lightened hair from turning yellow, use our purple shampoo, Cold Reflections Brightening Shampoo, once or twice a week. Read how to use purple shampoo.
- A gentle shampoo and fewer washes, so lengths aren't stripped. See sulphate-free shampoos.
Frequently asked questions
Is coconut oil good for bleached hair?
It can help as a pre-wash treatment, but pure coconut oil is heavy and can be hard to wash out of fine hair. A lighter blended oil is easier to use day to day.
Can hair oil turn blonde hair yellow?
Some golden-coloured oils can leave a slight warm cast on very pale or porous blonde if you use a lot and leave it to build up. Use a small amount and wash regularly; a purple shampoo keeps tone cool.
Should I use oil before or after bleaching?
Ask your colourist. Many prefer clean or unwashed hair before lightening and will advise on aftercare. Afterwards, oil is a good daily step.
How often should I use oil on bleached hair?
Every day as a finish is fine if you use a small amount. Use a pre-wash oil treatment once a week.
Can oil fix split ends?
No. Oil smooths split ends so they look better for a while, but only a trim removes them.
About the author
Charlotte Read has spent six years in the hair industry with Insight Professional and holds a First Class BSc in Business Management and Marketing. She writes with reference to real salons across social media and the wider Insight community, and draws on the Insight office team, who between them bring over 100 years of combined experience on salon floors.
Where technical expertise is needed, Charlotte consults Lorraine Matic, Head of Insight UK Education, who brings over 38 years of global experience in colour, technique and hair science.