Why laser works better for some people than others
The laser targets pigment in the hair. That one sentence explains most of the difference between a spectacular result and a disappointing one. Dark, coarse hair gives the laser something to aim at. White, grey and very fine pale hair does not — and no number of sessions changes that, because the target is not there.
The honest term is permanent hair reduction, not permanent removal. A good course produces a large and lasting drop in how much hair grows, how fine it is and how often you think about it. For many people some maintenance continues. Anyone promising total permanent removal is describing something the technology does not do.
What you cannot change
| Factor | Why it matters |
|---|---|
| Hair colour | The biggest factor by far. Dark hair responds best. Grey, white and most red or very pale blond hair responds poorly or not at all, whatever the device |
| Hair thickness | Coarse hair absorbs more energy and responds better than fine hair in the same area |
| Skin tone | This affects which device and settings are safe rather than whether laser works. Deeper tones need the right technology and an experienced operator — see laser on deeper skin tones |
| Hormones | PCOS, thyroid conditions, pregnancy, menopause and some medications drive new growth. This is the usual reason a course that worked still needs top-ups |
| Area treated | Underarms, bikini and legs are generally the most predictable. Face and neck are hormone-sensitive and less so |
| Growth cycle | Only hairs actively growing at the moment of treatment are affected. The rest are dormant, which is the entire reason a course is spread over months |
Why a course, and why the gaps
At any moment only a fraction of the hair in an area is in its active growing phase, and only that fraction can be affected. The next session is timed to catch a new cohort as it comes through. That is why the interval is chosen deliberately, why it differs between the face and the legs, and why sessions squeezed too close together simply treat skin rather than hair.
It is also why nobody can tell you your exact session count before seeing you. A range, after looking at your hair and skin, is an honest answer. A precise number quoted over the phone is a sales figure.
What you do control — and it matters more than people think
- Shave, never wax or pluck, between sessions. The laser needs the hair root in place. Removing it from the root means that session finds nothing to treat. The detail is in shaving before laser.
- Keep to the schedule. Drifting a six-week interval out to three months means the cohort you were meant to catch has already moved on. The sessions still cost you; they just do less.
- Stay out of the sun, and off the tanning bed. Recently tanned skin changes what is safe, which means reduced settings or a postponed appointment. Both slow you down.
- Finish the course. Results at session four look good enough that people stop. The later sessions are what make the reduction hold.
- Tell us about medication and conditions. Some medications increase light sensitivity, and some conditions explain new growth. Neither is a reason to refuse you treatment, but both change how we treat you.
What normal progress looks like
- Shedding for one to three weeks after a session. Treated hairs work their way out. It looks like regrowth and is not — a point we cover in aftercare.
- Patchiness partway through. Different hairs are at different points in their cycle, so an area clearing unevenly is expected rather than a fault.
- Hair returning finer and slower before it reduces in quantity. Texture often changes before density does.
- A plateau near the end. The last hairs are usually the finest and most stubborn, and they are the ones maintenance is for.
When laser is the wrong recommendation
If your hair is white, grey or genuinely very fine and pale, the responsible answer is that laser is unlikely to do much, and a clinic should say so before taking your money rather than after session six. That conversation should happen at the consultation, in front of a light, looking at the actual hair.
Similarly, if there is a sudden change in hair growth — new coarse growth in a new place, particularly with other changes — that is worth raising with a doctor before starting a course, because treating the hair does not address the reason for it.
Claims worth walking away from
- “Permanent hair removal, guaranteed.” The accurate term is permanent reduction.
- A fixed number of sessions promised before anyone has looked at you.
- Treating tanned skin at normal settings because you have already paid and are standing there.
- No patch test, particularly on a first course or a deeper skin tone.
- “It works on all hair colours.” It does not, and that is physics rather than opinion.
Where to find us
Downtown Montreal — 2365 rue Saint-Patrick, Unit A5
Laval — 1655 boulevard de l'Avenir
Saint-Léonard — 5045 rue Jean-Talon Est
West Island — 45 boulevard Brunswick, Dollard-des-Ormeaux
This page is general information and is not medical advice. Suitability depends on an assessment of your hair, skin and health. If you have had a sudden change in hair growth, please speak to a doctor.
