Quick answer: hair breaks when the hair fibre is weakened and then put under stress, usually by a mix of bleach or colour, heat, rough brushing, tight styles and dryness. To stop breakage, work out the cause, be gentler with wet hair, protect before heat, balance strengthening care with moisture, and trim away split ends before they travel. If you're seeing hairs that have fallen out from the root, or patches of thinning, that's shedding or hair loss rather than breakage, and worth talking to your GP about.
Is it breakage or shedding?
- Breakage: short pieces of hair with no root, snapped part-way along the strand. You'll often see short, uneven bits, a frizzy halo around the crown or hairline, or pieces on your clothes and in the sink.
- Shedding: full-length hairs with a small, light bulb at one end. Everyone sheds some hair every day, and many people notice more at certain times of year. See seasonal hair shedding.
If you're shedding more than usual or have noticeable thinning, speak to your GP. Shampoos and treatments can help with breakage, but they won't treat hair loss.
What causes hair breakage?
- Bleach and chemical services: lightening, colour and relaxers weaken the hair's internal structure.
- Heat: straighteners, curling tongs and hot blow-drying, especially without protection or at high temperatures.
- Rough handling: brushing wet hair, dragging through knots, rubbing with a towel.
- Tight styles: ponytails, buns, braids and elastics that pull in the same place every day.
- Dryness: hair that lacks moisture loses its stretch and snaps instead of bending.
- Too much protein: hair that's overloaded with protein can become stiff and brittle.
- Friction: cotton pillowcases, scarves and collars rubbing the same area.
- Sun, sea and chlorine: see sun protection for hair.
- Split ends left too long: splits can travel up the strand until it breaks. See split ends.
Does your hair need protein or moisture?
Try a simple stretch test on a clean, damp strand:
- It stretches a lot and doesn't spring back, or feels mushy: it likely needs strength (protein).
- It barely stretches before snapping, and feels rough or straw-like: it likely needs moisture.
- It stretches slightly and springs back: it's in good balance.
Our full guide explains more: protein vs moisture.
How to stop hair breakage
1. Strengthen weak hair
The Rebuild range is made for fragile, stressed and damaged hair. Rebuild Replenishing Shampoo is sulphate-free and helps hair regain structure and strength, and Rebuild Replenishing Hair Conditioner, with brown and red algae and organic avocado oil, reinforces the fibre to improve resistance and elasticity and help guard against breakage. For hair weakened by colour and heat, the Damaged Hair range uses organic wheat extract, olive oil and argan oil.
If your hair is fine and fragile, the Fortifying Hair Treatment is a lightweight, no-rinse lotion that strengthens weak, fragile hair without weighing it down.
2. Balance it with moisture
Strength without moisture leads to brittle hair. Alternate a strengthening mask with a moisturising one, such as the Restructurizing Hair Mask and the Nourishing Hair Mask. See how often to use a hair mask.
3. Detangle gently
Wet hair is at its most fragile. Detangle with conditioner in, or mist on Leave-In Hair Detangler, and work from the ends up with a wide-tooth comb. Never yank through a knot.
4. Protect before heat
Use Replenishing Thermal Care Serum, which protects up to 230°C, and keep tools at the lowest temperature that works. Our heat protectant guide covers straightener temperatures.
5. Cut the friction
- Pat hair dry with a soft towel or T-shirt.
- Switch to a smooth pillowcase, such as the Eco-Silk Pillow Case.
- Loosen tight styles and change where you tie your hair.
- Use snag-free hair ties rather than elastics with metal joins.
6. Trim regularly
Take off split ends before they travel. A light "dusting" every few months removes splits without losing visible length.
Breakage at the front, crown or ends?
- Hairline and front: often tight styles, headbands or straightening the same section every day.
- Crown: often friction from pillows, hats or a ponytail sitting in the same place.
- Ends: usually dryness, heat and split ends.
- Patchy breakage after a chemical service: talk to your stylist, who can assess the hair and recommend treatment.
Frequently asked questions
Can broken hair be repaired?
Not permanently. Snapped hair can't rejoin, but strengthening and moisturising care can make the remaining hair stronger, smoother and less likely to break further.
How long does it take to stop hair breakage?
Many people notice fewer broken pieces within a few weeks of a gentler routine. The short pieces themselves take time to grow out.
Is hair breakage caused by stress?
Stress is more often linked to shedding than breakage. If you're losing more hair than usual, speak to your GP.
What's the best shampoo for hair breakage?
A gentle, strengthening one such as Rebuild Replenishing Shampoo, followed by its conditioner. Pair it with heat protection and gentle detangling.
Do bond builders help with breakage?
They can help hair that's been weakened by bleach and colour. Ask your stylist whether a salon treatment is right for your hair.
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.