Nail care · Knowledge centre
How nails are read before extensions
Almost everything that decides whether a set survives is settled before anything is filed — in the state of the nail plate, the free edge and the cuticle area. This guide covers what is looked at, what each finding predicts, and which of them end the appointment for the day.
The nail is read before the design is discussed
The first thing looked at is not the set you want. It is the nail you have, and specifically the nail plate: whether it is thin or strong, whether there are ridges or white spots across it, and whether the cuticle area is clean or swollen.
That reading is the whole decision. It determines which system can be used, what length is realistic, which shape will survive your week, and whether a set happens at all today. An extension is chosen by looking at the condition of the nail, never by looking at a photograph.
It is also the reading that keeps the natural nail intact. The commonest mistake in this trade is starting a set without checking the plate first, and the second commonest is treating a small piece of lifting as a cosmetic detail rather than as a gap that water and bacteria are already getting into.
So nothing is filed before the nail has been read, and where the nail is not ready that day, no work happens that day. That is the rule the whole pillar rests on, and it is stated before a booking rather than after one.
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The plate is read first
Thin or strong, ridges, white spots — before any shape, length or design is discussed.
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The cuticle area counts
Clean or swollen, and prepped or not — it decides more of the retention than the product does.
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Condition, not a photograph
The nail decides what can be built. A nail that is not ready today is not worked on today.
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Lifting is not cosmetic
A gap under a set lets water and bacteria in. It is read as a finding, never overlooked.
Why the reading decides more than the product
Because an extension is only ever as good as the nail it is built on, and the nail is the one variable nobody can substitute for.
A healthy nail is easy to recognise: a pale pink nail bed, a smooth surface with no ridges, a strong free edge, and a cuticle that is clean and not swollen. On that nail almost anything sits well. A weak nail is equally easy to recognise — it bends, it peels away in layers from the edges, it gives under light pressure, and it carries white spots or deep ridges. That nail does not get a refusal; it gets a shorter length, a different shape, and often a different system.
Retention is read in the same look. A very oily nail plate, hands in water for most of the day, and a cuticle area that has not been prepped properly all predict a set that lifts early. A cleanly prepped, dry plate with a healthy cuticle, on hands that are looked after, comfortably gets three to four weeks. Knowing which of those you are before the set is started is what makes the answer honest.
And some findings are not a grading at all. A nail lifting away from its bed, a colour turning yellow or green, or pus around the nail are signs of infection, and nothing is built over any of them. Saying that at the reading is information; discovering it two weeks later is an infection.
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What healthy looks like
Pale pink bed, smooth surface, strong free edge, cuticle clean and without swelling.
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What weak looks like
Bending, peeling in layers from the edges, giving under light pressure, white spots, deep ridges.
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Three to four weeks, prepped properly
An oily plate, constant water work or an unprepped cuticle shorten it every time.
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Infection is not a grading
Lifting from the bed, yellow or green colour, or pus — nothing is built over any of them.
Reading one · The nail plate
Thin or strong, and what is written across it
This is the surface everything else will sit on, so it is read before anything else is discussed.
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Whether it is thin or strong
A plate that gives under light pressure, bends, or peels away in layers from the edges is a weak plate. It is not a refusal by itself — it changes the length, the shape and the system — but a plate already too thin to take any more pressure is where the answer becomes no, because the set is then the thing doing the damage.
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Ridges and white spots
Deep ridges and white spots across the plate are read as signs of a weak nail rather than as blemishes to be filed away. Filing them off is exactly the wrong response: over-filing thins the plate, and that is the damage that takes months rather than a sitting to undo.
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The free edge, and the nail bed under it
A strong free edge and a straight nail bed with a little natural length is the easiest nail there is to work on. A short nail bed with almost nothing on it is the hardest, because both the grip and the shape have to be built rather than found.
The limit of this reading: it tells us what can be built. It does not tell us how long you will keep it.
Reading two · The cuticle area
Clean, or swollen — and whether it has been prepped
This is the reading that predicts lifting, and it is the one guests least expect to be part of a nail appointment.
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Clean and flat, or inflamed
A healthy cuticle is clean and carries no swelling. A swollen cuticle area is read alongside the plate, because it changes both what is possible on the day and how carefully the area has to be handled.
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Overgrown, on a bitten nail
An overgrown cuticle on a short, bitten nail bed is the hardest combination on this pillar. It is worth doing — but the difficulty is stated at the reading rather than discovered when the set lifts.
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Whether it can be prepped properly
A cuticle area that is not prepped properly is one of the three reliable predictors of early lifting, alongside a very oily plate and hands that are in water most of the day. That is why the prep stage is the one never shortened, however late the appointment is running.
The limit here: prep can be done perfectly and still be undone at home. Hands in water for a long stretch straight afterwards will lift a set that was applied correctly.
Reading three · What stops it here
The findings that end the appointment rather than shape it
Some findings change the plan. These end it for the day, or send you somewhere other than a salon.
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Infection, and what it looks like
A nail lifting away from its bed, a colour turning yellow or green, and pus around the nail are the three signs. No set goes on over any of them, and the same applies to a fungal infection, a cut nail, a wound, or psoriasis patches on the nail.
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A previous set that is already lifting
Nothing new goes over lifting. The gap is what lets water and bacteria underneath, so it is dealt with rather than covered — and a nail already under someone else's treatment is left alone too.
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The findings that belong with a doctor
A nail coming fully away from the bed, a change of colour, pain, or infection that keeps returning are medical questions rather than salon ones, and you will be told so plainly. Diabetes, thyroid, any skin allergy, and a history of nail fungus or psoriasis are asked about at the same stage.
The limit here: most of these are a wait rather than a permanent no. Over-filed nails and damage from a bad removal come back in about three to four months.
After the reading · Difficulty and retention
Which nail you have, said out loud
The reading ends with two statements: how hard this set will be, and how long it is likely to stay on.
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The easy nail
A normal-to-strong plate with a little natural length and a straight nail bed. Everything sits cleanly on it, and it is the nail where the finish is most predictable.
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The difficult nail
A very thin, bitten nail with a short nail bed and an overgrown cuticle. Both grip and shape have to be created rather than found, and that is said before the appointment starts rather than after it.
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How long it will actually stay on
A cleanly prepped dry plate, a healthy cuticle and hands that are looked after get three to four weeks comfortably. A very oily plate, constant water work or an unprepped cuticle shorten that, and knowing which of those applies to you is part of the reading rather than a discovery afterwards.
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And what your hands do all day
Water work, your own housework, the gym and small children at home all point to something shorter, stronger and rounder — as do hospital and kitchen work, teaching and training. The length and shape you ask for is not always the one your hand and your week can carry, and the reason for a shorter answer always comes with it.
The limit of the whole reading: it can predict a set's life, not guarantee it. Nothing here is promised unbreakable, because that depends on how you use your hands.
What goes wrong before anything is applied
Every one of these happens at the reading or the prep stage — which is exactly why those stages are the slow ones.
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Starting a set without checking the condition of the nail plate.
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Read the plate, the free edge and the cuticle area first. That reading is the decision, not a formality before it.
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Treating a small piece of lifting as a cosmetic detail.
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Deal with it. The gap is where water and bacteria get in, and that is how an infection starts.
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Filing the natural plate thin so the product grips better.
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Leave the plate alone. Over-filing is the damage that takes months rather than a sitting to undo.
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Building over discolouration, swelling or a nail lifting off its bed.
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Stop there. Those are signs of infection, and a repeatedly infected nail belongs with a doctor.
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Choosing the system and the length from a photograph.
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Choose both from the nail plate and from what the guest's hands actually do all day.
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Shortening the prep because the appointment is running late.
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Give it the full time. The best design in the salon lifts within five days on prep that was hurried.
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Learning design before learning prep.
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Prep first, always. It is the first thing taught here, and design is what comes after it.
Questions about the reading
The treatment page covers what an extension involves. These are the ones about what is looked at first.
Why is my nail plate read before we talk about the design?
Because the plate decides everything the design sits on. Whether it is thin or strong, whether it carries ridges or white spots, and whether the cuticle area is clean or swollen determine which system can be used, what length is realistic, which shape will survive your week, and whether a set happens at all that day. An extension is chosen by looking at the condition of the nail, not by looking at a picture — and starting one without that check is the commonest mistake in this trade.
What do white spots and deep ridges on my nails mean?
They are read here as signs of a weak nail, alongside a plate that bends, gives under light pressure, or peels away in layers from the edges. They are not something to file off — filing them away thins the plate, and a thinned plate is the hardest damage on this pillar to correct. What they change is the length, the shape and the system chosen, and that change is explained rather than made quietly.
My nails bend and peel in layers. Can anything be built on them?
Usually, yes — with a shorter length, a stronger shape and often a different system. A weak plate is a grading rather than a refusal. Where it becomes a refusal is when the plate is already so thin that it cannot take any more pressure, because then the set itself is what does the damage. That is a judgement made on the nail in front of us rather than in advance.
When is a nail a doctor's problem rather than a salon's?
When the nail is coming fully away from its bed, when the colour has changed, when it hurts, or when it keeps getting infected however carefully it is looked after. Those four go to a doctor and we will say so rather than working around them. A fungal infection, pus, swelling, a cut, a wound or psoriasis on the nail all mean no set that day as well — nothing is built over an infection.
My nails were filed thin somewhere else. Will they recover?
Yes. Thinning from over-filing, and damage caused by a set being removed badly, both grow back — in about three to four months. What they do not do is recover inside the sitting they were damaged in, which is why over-filing is the mistake worth avoiding rather than repairing. In the meantime the length and the system are chosen around what the plate can currently carry.
Which nails are easy to work on, and which are difficult?
The easy nail is a normal-to-strong plate with a little natural length and a straight nail bed — everything sits cleanly on it. The difficult one is a very thin, bitten nail with a short nail bed and an overgrown cuticle, because both grip and shape have to be created rather than found. You will be told which of the two you have at the reading, along with how long a set is likely to stay on given your plate, your cuticle and what your hands do all day.
Tell us what your nails are doing
Describe whether they break, peel or bend, and whether anything around the nail is sore or swollen. You will get an honest read on what could be built on them, and whether today is the day for it.