Why Split Ends Form
A hair strand consists of three layers. The outermost is the cuticle, a sleeve of overlapping keratin scales that protect the inner cortex. At the tip of the hair, this cuticle receives the most physical stress: friction from pillowcases, heat tool contact, towel rubbing and chemical processes.
As the cuticle wears through at the tip, the cortex beneath is exposed and begins to unravel lengthwise. This is a split end. The cortex fibres have no mechanism for reattaching once separated. No product, treatment or serum permanently repairs the split. The only true solution is cutting.
Products slow the process of new splits forming and temporarily bind existing splits for cosmetic improvement. Understanding this distinction saves money on products claiming to "repair" split ends permanently.
The Six Types of Split End and Their Causes
Type 1: The Basic Split (Y-Shape)
The most common type. The hair shaft splits into two distinct strands at the tip in a Y-shape. Indicates the cuticle has worn through at one point and the split is progressing upward.
Cause: General hair damage from heat styling, chemical processing or mechanical stress over time. The earliest form of split end damage.
Management: Trim at the first sign of Y-splits. A Y-split left untrimmed becomes a more complex split within weeks.
Type 2: The Deep Split
A Y-split that has progressed further up the hair shaft, sometimes several centimetres from the tip. The two strands of the split are equal in length and both dry and fragile.
Cause: A basic Y-split that was not trimmed in time.
Management: Requires trimming above the top of the split to remove all damaged hair. Trimming below the split point leaves structurally weakened hair that will split again quickly.
Type 3: The Tree (Multiple Branches)
Multiple branches splitting off the main hair shaft in the same area. The shaft has experienced extensive cuticle breakdown at multiple points.
Cause: Severe, repeated damage. Common in highly processed hair (bleached, permed and relaxed within the same hair history) or hair with very high porosity.
Management: Requires significant trimming. The multi-branch pattern indicates damage extending further up the shaft than visible at the tip.
Type 4: The Taper (Thin, Tapered Tip)
The hair shaft gradually narrows and thins toward the tip without an obvious separate strand. The hair ends are visibly thinner and more fragile than the mid-length.
Cause: Most common in long hair that has not been cut in many months. The oldest section of the hair has worn progressively at the tips through daily friction.
Management: A trim of 2 to 3cm removes the tapered section and produces a visibly fuller, healthier-looking tip.
Upload a close-up photo of your hair ends or describe your hair's texture and history. The Hair Analyzer identifies the type and extent of split end damage, estimates how much hair needs trimming and recommends the maintenance schedule to slow new split formation.
Assess My Split EndsAsk About Hair DamageType 5: The Knot (Fairy Knot)
A tiny knot formed in a single hair strand that creates a hard bump along the hair shaft. Common in curly and coily hair types where the hair's curved structure causes it to coil back on itself.
Cause: Natural hair movement in curly and coily hair. Particularly common in type 3C and 4A to 4C hair. Not preventable entirely; frequency is reduced through consistent moisturising and protective styling.
Management: Carefully cut below the knot. Attempting to undo the knot causes breakage at that point. Do not pull or tug; the knot is too tight to release without damage.
Type 6: The Candle (Thinning Without Split)
The hair shaft narrows progressively from a normal diameter to a point over the last 2 to 5cm. Not technically a split but a precursor to one. The narrowed section is structurally weak and will split soon.
Cause: Severe dryness or damage that has thinned the cortex without yet separating it.
Management: Trim. Conditioning and moisturising treatment does not thicken a narrowed cortex; the thinning is structural damage.
Products That Slow Split End Formation
No product reverses an existing split end. These products slow new splits from forming and temporarily bind existing ones for cosmetic improvement:
Bond-building treatments (Olaplex No. 0 and No. 3, K18 Leave-In Molecular Repair Mask): These treatments work by reconnecting broken disulphide bonds within the hair cortex. They do not repair the cuticle but strengthen the cortex structure, reducing the rate at which the cortex separates when the cuticle wears. Use as a pre-wash treatment every 2 to 4 weeks.
Silicone-based serums: Applied to the hair ends, silicones coat the cuticle surface and temporarily bind split strands together for cosmetic improvement. The effect is not permanent; it washes out with the next shampoo. Moroccanoil Treatment, Redken Anti-Snap, GHD Serum all work this way.
Regular trimming schedule: The most effective anti-split strategy. Trimming 1 to 2cm every 6 to 8 weeks removes splits before they progress upward. Hair trimmed regularly at this frequency grows longer net length over 12 months than hair trimmed infrequently with larger cuts to remove damage.