Split Ends, Explained: Causes, Treatment and Prevention

Split ends are tricky little things – sticking out of slicked-back buns, frizzing at the tips, making hair tangle, and making styling more of an effort than it needs to be.

If this sounds all too familiar, you’re in the right place. Most people see split ends as something you trim away and move on from, but here at Redken, we know that hair damage runs deeper than the surface. That’s why our science-backed hair care targets damage at its source, helping protect the hair fibre and reinforce strength where it’s needed most.

Below, we’ll explain what causes split ends – breaking down what’s happening inside your hair, before exploring how to prevent split ends with our Acidic Bonding Concentrate range.

What are split ends?

Take a moment to look closely at the very ends of your hair.

If they separate into a V or fork into a Y, you’re looking at split ends – a visible sign that the hair fibre (which is made up of protective layers that keep your hair strong and flexible) has begun to weaken.

Split ends don’t just change how your hair looks; they affect how it behaves. With split ends, hair can begin to feel dry through the lengths, rougher to the touch and harder to style. Split ends may also make your hair more prone to breakage when damage goes unaddressed.

Over time, this breakage can limit how long hair is able to grow before it snaps. This can make it feel like your hair isn’t growing longer – even when growth at the scalp continues.

What causes split ends?

Damaged hair bonds are what causes split ends.

‘Hair bonds’ can also be described as the structure inside your hair that gives it strength and shape. When your bonds weaken, the outer layers of the hair lose support, the hair can no longer stay intact at the tips, and the ends fray and separate (or, in other words, ‘split’).

The damage that causes split ends is often linked to:

• Chemical processing such as bleaching, relaxing, or perming, which alters the hair’s internal structure and places stress on the bonds that hold the fibre together.
• Excessive heat styling, especially without heat protection, which gradually weakens the hair fibre and dries out the ends.
• Rough brushing habits, particularly brushing hair when it’s wet, when fibres are more elastic and prone to snapping.
• Aggressive drying, including harsh towel-rubbing, which increases friction along the lengths.
• Environmental factors, such as winter weather, humidity, and prolonged UV exposure – all of which can wear down the hair’s protective outer layer.

 

Are there split ends treatments?

Let’s start with a hard truth: once a split end has formed, the only permanent solution is a trim. That said, a well-formulated split ends treatment can still play an important role – both before and after you cut away the damage.

When hair fibres are weakened but not yet split, bonding treatments can help reinforce those vulnerable areas, slowing how quickly everyday stress turns into visible splitting.

Our Acidic Bonding Concentrate range is designed with this in mind. By supporting the bonds within each hair fibre, these formulas help strands hold together securely, creating hair that copes better with heat, brushing, and daily wear – which is exactly how to prevent split ends from forming again after you’ve trimmed them back.

How to prevent split ends: 6 management tips

At Redken, we know that how to prevent split ends means looking beyond quick fixes and adjusting the everyday habits and products you use.

Below are our six tips, covering everything from shampoos to pillowcases – all designed to help you avoid what causes split ends and keep your hair stronger between trims.

1. Switch to a sulfate-free fortifying shampoo and conditioner

Think of shampoo and conditioner as two steps that protect your ends in different ways.

A shampoo for split ends clears away the buildup that can weigh hair down – especially around split ends, where strands are thinner and more likely to snap. Our Acidic Bonding Concentrate pH-Balancing Shampoo uses hydroxy acid to lift residue from the surface of your scalp, while citric acid works inside the hair fibre to help recover weakened bonds.

Follow with our Acidic Bonding Concentrate Sulfate-Free Conditioner for split ends, applying it through the mid-lengths and ends. Its 11% Bonding Care Complex and citric acid help restore moisture lost during shampooing, allowing strands to move past each other during rinsing, drying, and brushing – reducing the friction that leads to split ends forming between washes.

Because both formulas are sulfate-free, they work harmoniously with chemically and colour-treated hair, helping maintain colour while avoiding any unnecessary dryness.

2. Incorporate bonding treatments and conditioners

Bonding treatments and leave-in conditioners for split ends support weakened bonds inside the hair fibre and help reduce further splitting after trims.

Our Acidic Bonding Concentrate Intensive Treatment for split ends is the most concentrated formula within our Acidic Bonding range. With 14% citric acid and Bonding Care Complex, it supports the internal structure of your hair weakened by damage. Used as a pre-shampoo treatment, it protects and primes the hair, so it’s better prepared to absorb the strengthening steps that follow.

At the end of your routine, apply our Acidic Bonding Concentrate Leave-in Conditioner. It’ll help lock in that support by delivering an acidic pH like that naturally found in hair. When applied to damp hair after cleansing, this leave-in conditioner for split ends feels weightless – while still providing a high level of protection for your hair.

3. Limit heat styling

As the lyrics of Sabrina Carpenter (whose hair care routine speaks for itself) go, “please, please, please” – take it easy on the heat.

Frequent heat styling places repeated stress on the hair fibre, wearing down its outer layers and increasing the risk of split ends.

If heat styling is unavoidable, our Thermal Spray Hair Hold protects hair from temperatures up to 230°C, reduces moisture loss, and even doubles as a hairspray – making it an efficient way to protect and style, without overloading your hair with products.

4. Get regular trims at the salon

Booking a trim in every six to eight weeks helps remove weakened ends before damage has the chance to travel further up the hair.

Treat trims as ongoing care (rather than a reset), and always remember to rebook your next appointment before you leave the salon.

Are you due for a trim? Find your nearest salon using our Redken Salon Locator.

5. Be gentle when handling your strands

How you handle your hair day to day plays a major role in how to manage split ends. Pulling, rubbing, and stretching the fibre – especially when it’s already weakened – creates mechanical stress that can lead to further splitting.

There are a few simple swaps you can make to help manage split ends more effectively:

• Swap your brush for a wide-tooth comb or detangling brush to reduce tension.
• Use scrunchies instead of tight hair ties or elastic bands.
• Try a silk or satin pillowcase to minimise friction overnight.
• Be extra careful when hair is wet, avoiding rough drying and opting for a microfibre towel instead.

 

6. Protect from environmental stressors

Even after you’ve trimmed split ends away, protecting hair from environmental stress is essential to stop damage from worsening or returning.

You can reduce this impact by spacing out chemical services, wearing hats or scarves to shield hair from UV exposure, and leaning on ultra-hydrating hair serums for split ends when conditions are especially drying or humid.

For daily protection, our Acidic Bonding Concentrate 24/7 Night & Day Serum is applied through the mid-lengths and ends to help defend against environmental stress. Formulated with polyglutamic acid – often described as the more successful sibling of hyaluronic acid – it can hold up to 5,000 times its weight in water, making it especially useful for keeping your ends hydrated and protected.

Now that you know how to prevent split ends with our Acidic Bonding Concentrate range, discover how this formula supports damaged curls.