Laser hair removal works by sending pulses of light into the skin, where the pigment (melanin) inside each hair absorbs the energy and turns it into heat. That heat disables the hair follicle at the root, reducing its ability to grow new hair. Because hair grows in cycles, it takes a course of sessions to treat each follicle at the right stage.
If you are tired of shaving, waxing and the regrowth that comes a few days later, you have probably wondered what actually happens during laser hair removal. It can sound technical, but the idea behind it is simple. In this guide we explain how the treatment works, why it targets the hair and not your skin, and why it takes more than one session to see lasting results.
How does laser hair removal work?
Laser hair removal uses a focused beam of light to target the pigment, called melanin, that gives your hair its colour. The process follows a well-established scientific principle known as selective photothermolysis, which simply means using light to create heat in one specific target while leaving the surrounding area unharmed.
Here is what happens in four steps:
- Light is absorbed by the hair. The laser releases pulses of light that pass harmlessly through the skin and are absorbed by the melanin in the hair shaft and follicle.
- Light becomes heat. As the pigment absorbs the light, it converts that energy into heat that travels down to the root of the hair.
- The follicle is disabled. The heat damages the follicle, reducing its ability to produce new hair.
- The hair sheds. Over the following days and weeks, the treated hairs fall out, and regrowth in that area becomes finer and sparser.
Because the laser is drawn to pigment, the contrast between darker hair and the follicle is what makes the treatment effective. Modern systems then use cooling and precise settings to protect the skin itself while the energy does its work below the surface.
Hair growth cycles, and why you need multiple sessions
The melanin in your hair acts like a magnet for the laser light. This is why the treatment can be so precise. The energy is preferentially absorbed by the pigment in the hair rather than the surrounding skin, which means the follicle can be heated and disabled while the skin around it stays protected.
Skin tone does play a role because skin also contains melanin. Older lasers struggled to distinguish between deeper skin tones, which is why suitability was limited. Newer medical-grade technology solves this by adjusting its settings to your individual skin and hair, and by cooling the skin throughout, so that a much wider range of people can be treated safely.
Electrolysis vs Laser Hair Removal
| How they compare | Laser (Sciton Omni) | Waxing | Shaving | Electrolysis |
|---|---|---|---|---|
| How it works | Light targets pigment to disable the follicle | Pulls hair from the root | Cuts hair at the surface | Electric current destroys each follicle |
| Longevity | Long-term reduction | A few weeks | A few days | Long-term, hair by hair |
| Comfort | Cooled, minimal discomfort | Can be painful | Painless | Can be uncomfortable |
| Speed | Treats many hairs per pulse | Moderate | Fast | Slow, one follicle at a time |
| Best for | Lasting reduction on pigmented hair, all skin tones | Short-term smoothness | Quick daily upkeep | Grey or very light hair laser can't treat |
Why laser hair removal needs several sessions
This is the part most people do not realise. Your hair does not all grow at the same time. Each follicle moves through a cycle with three phases:
- Anagen (the growing phase): the hair is actively growing and firmly connected to the follicle. This is the only stage where laser can effectively disable the root.
- Catagen (the transition phase): the hair stops growing and begins to detach.
- Telogen (the resting phase): the follicle is dormant before shedding and starting again.
At any given moment, only a portion of your hair is in the active growing phase, so a single session can only treat the hairs that are ready. By spacing your sessions to match the cycle, each appointment catches a new group of follicles at the right stage. This is why a full course, typically six to eight sessions, gives far better results than a one-off treatment.
What makes the Sciton Omni different?
At Eden Medical, we use the Sciton Omni Laser, and we were the first clinic in the world to launch it. Most laser hair removal systems rely on one or two wavelengths of light. The Omni combines three medical-grade lasers in a single system, which allows it to work safely across all skin tones and a wide range of hair types.
Three wavelengths, one treatment
- Diode: a workhorse wavelength that balances effective follicle targeting with comfort, well-suited to a broad mix of hair and skin types.
- Alexandrite: highly absorbed by melanin, making it efficient on finer and lighter-but-pigmented hair on lighter skin tones.
- Nd:YAG: a longer wavelength that reaches the follicle while bypassing more of the skin’s surface pigment, which is what makes treatment safer for deeper skin tones.
The system also uses smart skin typing and real-time cooling, so each pulse is tailored to you, and your skin’s surface is protected throughout. In practice, that means a more comfortable experience, fewer ingrown hairs, and a treatment that can be tailored to your individual hair and skin, rather than a one-size-fits-all approach.
Which hair and skin types can be treated?
Because the laser works by targeting pigment, it is most effective on hair that has visible colour. The Omni includes a wide range of tones:
- Suitable: thick or fine hair in dark brown, medium brown, dark blonde, auburn or darker red tones, across all skin tones, thanks to the Omni’s advanced technology.
- Not suitable: grey, white or very light blonde hair, because there is not enough pigment for the laser to detect and target the follicle.
If you are not sure whether your hair will respond, the best step is a consultation. Our team will assess your hair and skin and build a plan around what is realistic for you. You can read more about treatment areas for women and men.
How well does it work, and is it permanent?
Laser hair removal is best understood as long-term hair reduction rather than permanent removal. After a full course, most people see a dramatic and lasting drop in regrowth, and the hair that does return tends to be finer and lighter. With the Sciton Omni, many clients achieve up to 95% hair reduction across a course of treatment.
Results vary from person to person, and occasional maintenance sessions, usually once or twice a year, help keep the area smooth over time. Anyone promising guaranteed or permanent hair-free results is overstating what any laser can do. Honest, realistic expectations are part of good clinical care.
Laser hair removal at Eden Medical
Eden Medical offers medical-grade laser hair removal with the Sciton Omni across clinics nationwide. Every treatment is carried out by trained skin therapists, with the clinical oversight you would expect from a doctor-led group. The result is safe, tailored care, FDA-approved technology, and a plan built around your hair, your skin and your goals.
If you would like to find out whether laser hair removal is right for you, the next step is a consultation, where we assess your suitability and talk through your options and pricing.
Frequently asked questions
Does laser hair removal remove hair permanently?
How does the laser tell the difference between my hair and my skin?
Why can't laser treat grey or blonde hair?
How soon will I see results?
Treated hairs typically shed over the days and weeks after a session, and you will usually notice reduced regrowth as you move through your course. Because hair grows in cycles, results build gradually across your sessions rather than appearing all at once.
How soon will I see results?
Treated hairs typically shed over the days and weeks after a session, and you will usually notice reduced regrowth as you move through your course. Because hair grows in cycles, results build gradually across your sessions rather than appearing all at once.
