By LIV Clinic · Medically reviewed by Dr. Narathai Vichienkalayarut, M.D. · Published August 31, 2026

Hair does not grow on one schedule — which is the entire reason one session was never going to do it.

How many laser sessions until hair stops growing back? Most people need around six to eight sessions spaced four to six weeks apart for lasting reduction, because only hairs in their active growth phase respond to each treatment; regrowth afterwards is typically much finer and lighter, with occasional maintenance sessions.

The typical course

Six to eight sessions

Most people achieve meaningful, lasting reduction after around six to eight sessions, though this varies with your hair colour, thickness, area and skin type.

Spaced weeks apart

Sessions are usually four to six weeks apart, with facial areas sometimes needing shorter intervals than legs or backs.

Why more than one session is needed

Hair grows in cycles

Each hair moves through growth, transition and resting phases. Only hairs in the active growth phase contain enough pigment at the follicle to respond to the laser.

Catching each cycle

Because hairs are not synchronised, spaced sessions catch different hairs as they enter the growth phase — which is exactly why spacing matters.

What the research shows

Measured reduction

A clinical study of a rotational laser approach reported around 75% hair reduction across treated areas at six months, with hairs becoming thinner and more vellus-like.

Success builds with sessions

A study using long-pulsed Nd:YAG over six sessions found the success rate improved with successive treatments, and that coarse terminal hairs responded better than finer ones.

Sessions by area

*Illustrative; your course is confirmed at consultation.

Does hair stop growing back completely?

Reduction, not elimination

An FDA device document defines permanent hair reduction as a long-term, stable reduction in regrowing hairs measured at 6, 9 and 12 months — not removal of every hair.

What regrowth looks like

Any regrowth is typically much finer, lighter and sparser than the original hair, and far easier to manage.

What affects your number of sessions

Your course length depends on:

• Hair colour and thickness — dark, coarse hair responds best
• Your skin type and the laser used
• The area being treated
• Hormonal factors, especially on the face
• How consistently you attend on schedule
• Sun exposure between sessions

Getting the most from your course

To reach lasting reduction efficiently:

1. Have a consultation to plan your course and intervals.
2. Attend sessions on schedule rather than delaying them.
3. Shave between sessions — never wax, pluck or thread.
4. Avoid sun exposure and tanning throughout the course.
5. Complete the full course before judging results.
6. Book occasional maintenance sessions afterwards.

Laser hair removal courses at LIV Clinic Koh Samui

At LIV Clinic, laser hair removal courses are planned by Dr. Narathai around your hair and skin type. Read about laser hair removal for darker skin, or book a consultation.

Frequently asked questions

Safety and consultation

Laser hair removal is a medical laser procedure and, like any energy-based treatment, carries some risk — common temporary effects can include redness, mild swelling around the follicles and a warm sensation, while less common effects such as pigment changes or blistering are minimised by correct laser choice and settings. Results vary from person to person, and no specific outcome can be promised. This article is general information, not medical advice.

At LIV Clinic, every treatment begins with an in-person assessment by Dr. Narathai Vichienkalayarut, M.D., who reviews your skin, medical history and goals before recommending a personalized plan. Book a consultation to find out whether this treatment suits you.