Brookline, MA

How Does Laser Hair Removal Work?

March 28, 2025

Laser hair removal is one of the most effective methods for long-term hair reduction, but how does it actually work? Understanding the science behind the treatment can help you feel confident in your decision to ditch razors and waxing for good.

How the Laser Targets Hair

Laser hair removal works by using a concentrated light beam to target and destroy hair follicles. The laser is attracted to melanin (pigment) in the hair, and when the pigment absorbs the laser’s energy, it turns into heat. This heat damages the follicle, preventing future hair growth without harming the surrounding skin.

The Hair Growth Cycle

Not all hair is in the same stage of growth at the same time, which is why multiple laser sessions are required for best results. Hair grows in three main phases:

  1. Anagen (Active Phase): Hair is attached to the follicle and actively growing. This is the ideal phase for laser hair removal because the follicle absorbs the most energy.
  2. Catagen (Transition Phase): The hair detaches from the follicle and stops growing. Laser treatment is less effective in this phase.
  3. Telogen (Resting Phase): The hair is fully detached and waiting to shed before a new hair grows. The laser has no effect during this phase.
    Since only 20-30% of hair is in the anagen phase at any given time, multiple treatments (typically 6-8 sessions) are needed for permanent hair reduction.

Who Is Laser Hair Removal Best For?

Laser hair removal is effective on most skin tones and hair types, but it works best on those with darker hair and lighter skin due to the contrast needed for the laser to detect the pigment. However, modern laser technology has expanded the range of treatable skin tones.

At Dream Spa Medical, we use advanced laser systems that can safely and effectively treat all skin types. If you’re unsure whether you’re a good candidate, our specialists can customize a treatment plan for you.

What to Expect After Laser Hair Removal

  • Mild redness and sensitivity similar to a mild sunburn (this subsides within a few hours).
  • Hair shedding a few days after treatment, which is part of the natural process.
  • Gradual reduction in hair growth with each session until the treated area is smooth and hair-free.

Laser hair removal is a safe, effective, and long-term solution for reducing unwanted hair. With a proper treatment plan and a trained provider, you can achieve smooth, hair-free skin for years to come!