How Long Does Underarm Laser Hair Removal Last?

If you're tired of constantly shaving, waxing, or plucking underarm hair, laser hair removal might sound like a dream come true. But before you commit, you probably have one big question: how long does underarm laser hair removal actually last? Is it permanent? Does the hair ever grow back? Let’s dig into the facts, break down the science, bust myths, and help you decide if it’s worth the investment.

What Not to Do Before and After Underarm Laser Hair Removal

What Is Underarm Laser Hair Removal?

Laser hair removal works by using concentrated light beams (lasers) to target and destroy the hair follicle. The pigment in the hair absorbs the light, which damages the follicle enough to delay future growth.

Underarm laser hair removal specifically targets the armpit region, a small area that responds well to treatment due to its relatively coarse and dark hair (which lasers love).

So, How Long Does It Really Last?

It depends on your hair type, skin type, hormone levels, and number of sessions.

Laser hair removal is not always 100% permanent for everyone. However, it significantly reduces hair growth—often by 70% to 90% after the full course of sessions.

Here’s a general timeline:

• After one session: You’ll likely notice slower regrowth and some patchiness.
• After 6–8 sessions: Most people experience long-term hair reduction, with many enjoying smooth underarms for months or even years.
• Maintenance sessions: Some people need a touch-up once or twice a year to stay smooth.



What Research Says

According to a study published in the Journal of Clinical and Aesthetic Dermatology, most patients experience a significant reduction in hair count after a series of laser treatments. The study emphasized that long-term results are best maintained with periodic maintenance treatments, especially in hormone-sensitive areas like the underarms.

Another clinical review from the American Society for Dermatologic Surgery notes that “laser hair removal offers lasting hair reduction rather than complete hair removal” and that results vary based on the technology used (e.g., diode, Alexandrite, Nd:YAG lasers) and individual characteristics.

Can I Use Deodorant After Underarm Laser Hair Removal?

Does Underarm Hair Grow Back After Laser?

Yes, but not the same way it used to.

Laser hair removal doesn’t destroy all hair follicles—some may be damaged, not completely eliminated. Over time, some follicles can recover, especially if triggered by hormonal changes, such as pregnancy, PCOS, or even stress.

However, hair that grows back is often:

• Finer
• Lighter
• Less dense
• Slower to return

What Reddit Users and Real People Say

We gathered comments from users on Reddit’s skincare and beauty threads who’ve undergone underarm laser hair removal:

“It’s been 2 years since my last session and I’ve only had a few fine hairs grow back. Totally worth it.”

“I still shave once in a while, but it’s like once every few months and takes 5 seconds. My underarms are 90% hair-free.”

“After my 6 sessions, I stayed smooth for about a year, then did a touch-up. Haven’t shaved in ages.”

How Many Sessions Do You Need for Long-Lasting Results?

Most clinics recommend a course of 6 to 8 sessions, spaced about 4 to 6 weeks apart. Why?

Because your hair grows in cycles—anagen (growth), catagen (transition), and telogen (rest). Laser is only effective during the anagen phase, so multiple sessions ensure you catch every hair at the right time.

How Many Sessions for Underarm Laser Hair Removal?

Factors That Affect How Long It Lasts

1. Hair Color and Thickness

The darker and coarser your hair, the better the laser works. Light, fine, or grey hair may not respond as well.

2. Skin Tone

Certain lasers work better for specific skin tones. For example:

• Diode and Alexandrite: Great for light to medium tones
• Nd:YAG: Better suited for deeper skin tones

3. Hormonal Health

Hormonal imbalances (like PCOS) can cause persistent regrowth. In such cases, more frequent maintenance may be needed.

4. Quality of the Laser Machine and Technician Skill

Results can vary drastically depending on the clinic’s technology and your technician’s experience. Medical-grade lasers generally provide better, longer-lasting outcomes.

Is Underarm Laser Hair Removal Permanent?

It’s more accurate to call it permanent hair reduction, not removal. Some follicles are destroyed permanently, while others may be only temporarily disabled.

With proper sessions and maintenance, you can enjoy hair-free underarms for   years, with just occasional touch-ups.

How to Make the Results Last Longer

• Stick to your full session plan. Skipping sessions means you may not target all the hairs effectively.
• Avoid waxing or plucking. These remove the hair root, which the laser needs to target.
• Use SPF if underarms are exposed. Laser-treated skin is more sun-sensitive.
• Stay consistent with maintenance. A yearly touch-up keeps results fresh.

Pros and Cons of Underarm Laser Hair Removal

Pros

• Long-lasting smoothness
• Less sweat and odor buildup
• No razor burn or ingrown hairs
• Saves time and money long term

Cons

• Upfront cost
• Some discomfort during treatment
• Requires multiple sessions
• Not always permanent

Cost vs. Duration: Is It Worth It?

A full underarm laser package can cost between $200 and $600, depending on your location and clinic. While it may seem pricey, compare that to a lifetime of razors, shaving cream, waxing, and time—and it starts to sound like a solid investment.

Bottom Line: How Long Will You Stay Hair-Free?

• Most people enjoy 6–12 months of smooth underarms after the initial course.
• With touch-ups every 12–18 months, you can maintain long-term results.
• Some see permanent reduction of 80–90% of hair.

Final Verdict

Underarm laser hair removal is not an overnight miracle, but with the right expectations and commitment, the results are truly life-changing. If you're looking for a semi-permanent solution that saves time and stress in the long run, it’s absolutely worth considering.