Last Updated on May 3, 2025 by Caesar
Laser hair removal is more than just a cosmetic trend. It is a scientifically proven method that targets unwanted hair at its root, using precise light-based technology. Understanding the biology behind hair growth and how lasers interact with your skin can help you make an informed decision before starting treatment.
Here is a closer look at the science that makes laser hair removal both safe and effective.
Hair Growth and Its Phases
Hair growth happens in cycles, and not all hairs are in the same phase at the same time. There are three main phases:
- Anagen (Growth Phase)
The hair is actively growing and still attached to the follicle. This phase is the best time for laser treatment, as the hair root is rich in melanin. - Catagen (Transition Phase)
The hair stops growing and begins to detach from the follicle. - Telogen (Resting Phase)
The hair falls out, and the follicle remains dormant for a time before new growth begins.
Because lasers only affect hairs in the anagen phase, multiple treatment sessions are necessary to achieve full results.
The Role of Melanin
Melanin is the pigment in your hair and skin that gives it color. Laser hair removal works by targeting this pigment within the hair shaft. The laser emits a concentrated beam of light that is absorbed by melanin, which then converts into heat.
That heat travels down the hair shaft into the follicle. Once inside the follicle, the heat damages the structure responsible for hair production, especially the bulb and bulge. This damage slows or even stops future hair growth.
Selective Photothermolysis
This process is known as selective photothermolysis, which combines four core concepts:
- Selective means the laser targets melanin and not the surrounding skin.
- Photo means it uses light energy.
- Thermo refers to the heat generated from that light.
- Lysis means the destruction of the hair follicle.
By targeting melanin in a controlled way, the laser disables the hair root without harming the skin.
Custom Settings for Individual Skin Types
Laser hair removal is not a one-size-fits-all treatment. It requires adjustments based on skin tone, hair thickness, and hair color. The wavelength, pulse duration, and intensity of the laser must be carefully selected for each individual.
- People with light skin and dark hair often respond best because the contrast allows for more precise targeting.
- Those with darker skin can also benefit, but require lasers like the Nd:YAG that reach deeper into the skin and avoid excess heat on the surface.
At New Med Spa in Carmel, we customize every treatment plan to ensure safety and optimal results for all skin types.
Why You Need Multiple Sessions
Since only about 20 to 30 percent of your hair is in the growth phase at any time, one treatment cannot remove all unwanted hair. That is why laser hair removal is done in a series of 6 to 8 sessions, spaced 4 to 6 weeks apart.
Each session targets a new batch of follicles in the growth phase. Over time, this reduces the density and visibility of hair in the treated area.
Comfort Through Cooling Technology
Lasers create heat, which can sometimes be uncomfortable. To improve your experience, many laser devices include cooling features that protect the skin and reduce pain.
Some examples include:
- Contact cooling tips
- Cold air blowers
- Cryogen sprays applied before each laser pulse
These technologies make treatments more comfortable, especially in sensitive areas.
Results You Can Expect
After completing a full series of treatments, most clients experience a 70 to 90 percent permanent reduction in hair. The remaining hairs are typically finer and lighter. Occasional maintenance sessions can keep results looking smooth for the long term.
Book a Science-Based Solution at New Med Spa
Laser hair removal is backed by real science and proven to deliver lasting results. At New Med Spa, our licensed professionals use advanced technology and personalized plans to safely and effectively remove unwanted hair.
Schedule a consultation today at our Carmel location to start your journey toward smoother skin.
