Two curls get confused more than any others in this industry, and it costs artists sets.
CC and D sit next to each other on every curl chart, which makes them look like neighbours — a bit more lift, a bit more drama. In practice they behave very differently, and the thing that decides between them usually isn't the look your client asked for.
It's which way her lashes grow.
The Short Answer
D is considerably stronger and rounder than CC. It's the most dramatic curl we make.
But a curl doesn't produce a fixed result — it produces a result relative to the natural lash it's sitting on. So the same D curl can look spectacular on one client and closed-in and strange on another, with nothing changed but the lash underneath.
(Growth direction is the biggest factor between these two, though it isn't the only one — eye depth and brow position matter too. Our guide to matching curls by eye shape and type covers all five, and the complete curl guide explains every curl in the range.)
The Table That Should Decide It
|
Natural lash grows... |
CC gives you |
D gives you |
|
Upward |
A D-curl effect — strong lift |
Too much. It turns in on itself and reads round and closed |
|
Straight out |
A softer result, closer to a CC |
A true, strong, open lift |
|
Downward |
Closer to a C curl |
Roughly a CC effect |
Read that table once and the two most common mistakes become obvious.
Mistake one: using D on upward-growing lashes because the client wants drama. You get a lash that curls back towards the lid — the opposite of open.
Mistake two: using CC on downward-growing lashes and wondering why the set looks flat. It's reading as a C, because that's what CC does on that lash.
The Rule Worth Memorising
If your client's lashes already grow upward and she wants a D-curl look — give her CC.
The natural lash is already doing half the lifting. CC adds the rest. You land exactly where you wanted without the over-rounding that D would bring.
This one rule prevents more disappointing sets than any other piece of curl knowledge.
So When Is D Actually the Right Call?
D has a reputation as the "dramatic" curl, and that reputation means a lot of artists reach for it when a client says she wants a bold look. Honestly, the roundness doesn't suit as many eyes as its popularity suggests.
D earns its place on:
- Straight-growing natural lashes, where it delivers genuine lift rather than over-curl
- Downward-growing lashes, where it lands at about a CC effect — which is often exactly right
- Almond and narrow eye shapes
- Normal set eyes
- Hooded lids, especially with more mature skin and straight-growing lashes. This is where D really earns its keep: the strong lift carries the lash line up and clear of the hood, where a softer curl would disappear underneath it. Worth saying that D isn't the only answer to hooding — how much lift you need depends on where the hood falls and how the lashes grow — but when the hood sits across the whole lid, D is the most reliable choice.
Avoid D on:
- Protruding eyes — it emphasises the projection
- Strongly upward-growing lashes — it turns in on itself
- Low-set brows — there isn't enough room between lash line and brow for a curl this strong, and it crowds the space
Check carefully before using D on deep set eyes. A deep set eye needs the lash brought forward out of the socket rather than driven upward — and a strong lift can carry the extension up into the brow bone. D occasionally works on a shallower deep set eye, but assess the socket depth first, and if in doubt choose a curl that projects rather than lifts.
Where D is the obvious answer: high-set brows. A wide gap between eye and brow reads as disproportionate, and D's strength closes it — bringing the lash line up to balance the face.
And When Is CC the Better Tool?
CC is one of our two best-selling curls because it's quietly the more versatile of the pair.
CC suits: straight, curved and downward-growing natural lashes · almond, round and narrow eyes · normal set and protruding eyes.
That's a much wider brief than D's. CC handles downward-growing lashes that C can't lift and D would overpower, and it's safe on protruding eyes where D isn't.
Two caveats:
On protruding eyes, check the growth direction before you commit. If those lashes already grow upward, CC will read closer to a D — and on strongly curved natural lashes it'll look stronger than you intended.
On deep set eyes, CC works sometimes rather than always. It's a middling lift, so it sits on the edge of what a deep socket can take — judge it against the brow bone the same way you would a D.
The Consultation: When She Asks for the Wrong Curl
Clients arrive having seen a D-curl set on Instagram. The set they saw was on someone else's lashes.
You don't need a technical lecture — you need one sentence that reframes it:
"The curl that gives you that look depends on which way your own lashes grow. Yours already grow upward, so a CC will get you there — a D would actually curl back towards your lid and make your eyes look smaller, not bigger."
That does three things at once: it explains, it demonstrates expertise, and it gives her a reason to trust your judgement over a photo. Clients almost always take the recommendation when they understand the why.
And if she still wants D? Do a small section first and show her. The mirror settles it faster than either of you arguing.
Applying Them — D Asks More of You
CC is straightforward under the tweezer. D isn't, and the reason is worth understanding because it's a retention issue, not a cosmetic one.
A strongly bent curl meets the natural lash across a shorter span. A CC sits along the lash for a good distance before curving away. A D touches and curves away almost immediately — so there's simply less bonding area available to you.
It's most pronounced in shorter lengths, where the curve is tight relative to the length of the extension. On an 8mm D curl there is very little contact zone to work with.
So place D precisely. Take the extra moment to seat it for the maximum contact you can get. The same rushed placement that a CC would forgive will cost you retention on a D — and it'll look like a glue problem, or a prep problem, when it was neither.
The practical rule: if you're using D in shorter lengths, slow down for those lashes specifically. That's where the contact zone is smallest and the margin for error is thinnest.
FAQ: CC vs D Curl
What's the difference between CC and D curl?
D is significantly stronger and rounder. CC gives a natural eye-opening lift; D gives maximum lift and is the most dramatic curl in the range.
Should I use CC or D for a dramatic look?
Check the growth direction first. On upward-growing lashes, CC already produces a D-like effect and D over-rounds. On straight or downward-growing lashes, D delivers the drama properly.
Can I use D curl on hooded eyes?
Yes, and it's one of D's best uses when the hood sits across the whole lid and the lashes grow straight — the lift carries the lash line clear of the hood. It isn't the only option though: hooding is a lid condition rather than an eye shape, so how much lift you need depends on where the hood falls and how high a lash line the client wants.
Why does my D curl set look closed or round?
Almost certainly because the natural lashes grow upward. The curl is adding to a lift that's already there, so the lash turns back on itself. Switch to CC.
Why does my CC curl set look flat?
Likely downward-growing natural lashes, where CC reads as a C. Step up to D, which will land at roughly a CC effect on that lash.
Can I use D curl on deep set eyes?
Check the socket depth first. Deep set eyes need the lash brought forward out of the socket rather than lifted, and a strong curl can send the extension into the brow bone. It sometimes works on a shallower deep set eye, but a projecting curl is the safer default.
Does brow position affect the choice?
Yes, and it's often overlooked. Low-set brows leave little room above the lash line, so D crowds the space — go softer. High-set brows leave a gap that D closes well, bringing the face into proportion.
Why does my D curl set lift sooner than my CC sets?
Most likely the contact zone. A strong curl meets the natural lash across a shorter span than a gentler one, so there's less bonding area — and least of all in shorter lengths. Precise placement on D matters more than it does on CC.
Is D curl bad for the natural lash?
No more than any other curl — weight and placement determine lash health, not curl. But a curl that fights the natural growth direction is more visible as a poor result, which is reason enough to match properly.
Pick the curl for the lash in front of you, not the photo on the phone. Explore the full curl range — B, C, CC, D, L, L+ and M — in our complete lash curl guide, or shop Smooth Collection trays at I AM Lash PRO.
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