Before you straighten
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Some days we did eleven Japanese straightenings. Some days eight. That went on for years at 57th Street after the television segments ran, and it means I have watched this service on more heads than most people will ever see.
This page is what I would tell you before you sat down.
The question that matters most
What has already been done to your hair?
Not what you think has been done. What has actually been done, including things you have forgotten, things done years ago, and things done in another country by someone whose product you never saw.
The reason this matters more than anything else on this page: relaxer chemistries do not mix. A thio-based Japanese straightener applied over hair that has been treated with a different relaxer system is how hair dissolves in the sink. Not damaged. Dissolves.
Clients did not always know. Some had genuinely forgotten. Some had been told something vague by a previous stylist. Some had bleached over an old relaxer and assumed the colour service had somehow reset the slate — it does not, and the underlying damage is still there months later.
So the stylist has to find out another way.
The strand test, and why refusing one is a red flag
You take a small cutting of hair and you test it before you touch the head.
You can learn an enormous amount this way. I could often identify what a client had used from the smell of the hair itself, or from the fumes the strand gave off when a different chemistry was applied to it. One brand from Canada had a smell I have never been able to describe to anyone but would recognise instantly thirty years on.
The signal that ended the appointment was burning rubber. If the test strand smelled like that, we refused the service. Not rescheduled — refused.
A salon that will not do a strand test on hair with any processing history, or that waves off the question of what you have used before, is telling you something. A good one will insist on it, and will occasionally tell you no.
Being told no is the service working.
What happens when it goes wrong
The hair does not look damaged and then recover. It breaks, and broken hair does not come back.
There is no product that repairs it. Bond builders and protein treatments can make compromised hair behave better and feel stronger, and that is genuinely useful, but they do not restore what has broken. Anything sold as repair is managing the situation.
Which leaves one route: grow it out and cut it off.
The arithmetic nobody wants
Hair grows about half an inch a month. Six inches a year, and that is set mostly by genetics and your general health.
But be careful how you apply that number, because it is not a countdown to repair. In a year you get six inches of healthy new hair at the roots, and the damaged section has moved six inches further down the strand. It has not improved. It has only travelled.
So the real question is how long you intend to keep your hair. If you wear it short, the damage is gone within a year of steady trims. Shoulder-length, and you are looking at two years or more of cutting into it a little at a time. Mid-back, longer still — potentially three.
That is the arithmetic. Six inches a year of new hair, and a wait determined not by the damage but by the length you want to end up with.
Nothing shortens it. Not supplements, not laser devices, not expensive masks. Devices and nutrition can help more hair stay on your head and reach its full length — that is a real effect and a different one. The strand itself grows at the speed it grows.
I say this bluntly because the alternative is watching someone spend a year and a great deal of money looking for a shortcut that does not exist, when the answer was a series of shorter haircuts.
What we would not offer
During those years the keratin straightening treatments were everywhere. Cheaper than Japanese straightening, faster, and in enormous demand. We did not offer them.
The reason was formaldehyde. Those smoothing treatments released it when heat was applied, and the exposure fell hardest on the people standing in that room all day breathing it — my staff. It was not a close call.
If you are considering a smoothing service, ask what is in it and ask about ventilation. "Formaldehyde-free" on a label has historically not been the same as formaldehyde-free under a hot iron.
Who should not have it done at all
Some heads are not candidates, and a good stylist will say so.
Hair that is already breaking. If strands snap when you stretch a wet one gently, the hair does not have the structural margin for another chemical process. Fix that first, which means time and haircuts.
Recently bleached hair, and particularly hair bleached over previous processing. Bleach and relaxers both attack the same structure from different directions.
Anyone who cannot say with confidence what has been used before, where the strand test comes back ambiguous. Uncertainty is a reason to wait, not a reason to proceed carefully.
A scalp that is sore, broken, scratched or recently coloured. These are chemical services applied close to living skin. Anything already irritated will be considerably more irritated afterward.
Choosing where to have it done
Price is a poor signal here and availability is worse. What you want to hear from a salon:
They ask detailed questions about your history before quoting anything. They do a strand test as standard rather than on request. They can tell you which system they use by name. They talk about ventilation without being prompted. And they schedule enough time — this is not a service that goes well when the chair is needed in ninety minutes.
What should worry you: a quote given over the phone with no questions, a stylist who is vague about the product, and anyone who tells you every head is fine.
Keeping straightened hair alive
If you have had the service and it went well, the aftercare is not complicated but it is not optional.
Wash gently and rarely. Scalp and roots only. Let the suds clean the lengths as they rinse. Straightened hair has already had its structure rearranged; it does not need daily detergent as well.
Skip the clarifying shampoos except as an occasional reset. They strip, and stripped processed hair is brittle processed hair.
Condition the ends, comb from the ends upward. Processed hair tangles differently and breaks more easily at the point of tension.
Heat, carefully. You have already used your chemical budget. Use a protectant, keep the dryer moving in the direction the hair travels, and let sections cool before touching them again.
Space the services out and treat regrowth-only application as the standard, not full-length reapplication. Overlapping onto already-processed hair is the second most common way this goes wrong, after mixed chemistries.
If you are colouring as well
Do not do both on the same day, and tell each stylist about the other.
Porous hair takes colour unevenly, and chemically processed hair is porous by definition. A protein treatment before colouring gives the colour something to attach to, which is the difference between an even result and a blotchy one — but no more often than every six weeks, because too much protein makes hair brittle and the brittleness looks exactly like the dryness people then try to treat with more product.
The short version
Tell your stylist everything. Insist on a strand test. Accept a no. Assume broken hair means a year of shorter cuts, because it does.
And find a salon willing to turn down your money. Those are the ones worth sitting in.
Where to buy
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Birch wood round brush
Wooden bristles, for a polished finish.
See the brushes -
Ceramic round brush
Lighter, and runs hotter.
See the brushes -
Paddle and wet-dry brush
Detangling and working product through wet hair.
See the brushes
My own brushes. These are not affiliate links.