Short answer: not permanently. No device and no specialist can guarantee that, and if someone does, treat it as a warning sign. What laser hair removal does give you is a solid result: after a course the hair is gone for a long time, and whatever comes back behaves nothing like it used to.
What the laser does to hair
The beam is absorbed by the pigment inside the hair and turns into heat. The heat travels down the hair to the root and damages the follicle, the bulb the hair grows from. A destroyed follicle grows no more hair.
That only works while the hair is in its active growth phase and still attached to the root. At any given moment only some of your hair is in that phase; the rest is dormant. That is why hair removal is done as a course: each session takes out its share of active follicles, and fewer are left each time. Why hair "grows" between sessions and when that is a good sign: why is hair still growing after laser hair removal?.
Sources: StatPearls (NCBI), 2023, Cleveland Clinic
Why permanent is a marketing word
Permanent is a word from advertising, not from practice. Some damaged follicles recover, some dormant ones wake up later, and that depends on your physiology rather than on the machine.
The trade term is not permanent removal but long-term reduction of hair growth. The first one is promised to sell a course. The second is what you actually get.
What a finished course looks like
In our practice since 2019 a course runs to 6 to 10 sessions on average. By the end most of the hair has stopped growing, and what remains is thinner, lighter and sparser: no longer stubble but fine fuzz that often needs no shaving at all.
After that, 1 to 2 top-up sessions a year are usually enough. It does not mean the course failed: over time the odd follicle wakes up, and clearing it in a single visit is easier than waiting for the hair to grow back in full.
What can wake growth up again
Hormones. This is the main reason hair returns even after a good course. Pregnancy and birth, starting or stopping hormonal contraception, the thyroid, polycystic ovary syndrome - any of these can start growth in a place that had been clear for years.
Some medications and heavy stress play a part too. That does not undo the course: less hair comes back than before, and top-up visits handle it quickly.
Sources: NHS, PMOS (formerly PCOS, polycystic ovary syndrome)
Who the laser will not help
The laser sees pigment. If the hair is very light, red or grey there is almost no pigment in it, the beam has nothing to grab, and the result will be poor or none at all. We do have clients with light hair the laser worked on, but they are the exception. So at the consultation we look at your hair first and talk about a course second.
The only method officially called permanent hair removal is electrolysis, where each follicle is treated individually with a needle. It works on light hair too, but it is slow and suits small areas. We do not offer it, and if that is your case, we will tell you.
Sources: Cleveland Clinic
How to tell the course is working
Judge it by how the hair behaves rather than by how much is left. Session by session it should grow back slower, thinner and sparser, and the gap between visits should get longer. If that is happening, the course is doing its job.
We track your hair growth throughout the course and book the next session when the hair has regrown: how often to go for laser hair removal.
Reviewed by: MEDULLA team