Why Is 4 Level Laser Better Than 3 Level Laser?

Last Updated On November 14, 2021 By Elliot

A 3 level laser has been around for years and has become the standard for laser hair removal.

It works by targeting the pigment in your hair follicles and removing the pigment directly. The problem is that sometimes the treatment doesn’t work at all or leaves unwanted marks.

4 level lasers are designed to target the root of your hair follicle and remove the entire follicle. This means that the pigment inside the follicle is completely removed and there are less chances of side effects.

I’ll give you the pros and cons of both 3 level and 4 level lasers and let you decide which one would work best for you.

The pros and cons

3 Level Laser Pros:

  • It targets only the pigment, not the actual hair itself. So it will leave no visible scars on your skin.
  • You can use this method multiple times a week without any downtime.
  • There is minimal risk of burning your skin since it does not go deep into the dermis layer.


  • If done incorrectly, it could cause burns.
  • It takes longer time to treat large areas like legs/arms
  • Can be expensive if used frequently

4 Level Laser Pros:

  • No need for numbing cream before treatments as they don’t require injections.
  • Treatments take much shorter amount of time compared to other methods.
  • They have higher success rate with larger area coverage.
  • Less chance of scarring due to deeper penetration.
  • More effective when treating dark hairs. Lower cost compared to other options.


  • Requires more sessions per area treated.
  • Treatment requires an injection
  • May burn your skin during treatment

3 point laser level vs 4 point laser level which one is better?

The 3 and 4 laser level has energy difference and their average power are different. But what exactly do these numbers mean?

Laser levels refer to how many watts of light each laser emits. A watt measures the intensity of light emitted from a device. It tells us how powerful the laser is.

For example, a 1W laser produces 1000 Watts of light while a 10W laser produces 100000 Watts of light.

So basically, a 5W laser is equivalent to 50% of a 1W laser.

The energy levels can also be measured in milliwatts. For example, a 2 mw laser is twice as strong as a 1 mw laser.

Now we know about the differences between 3 and 4 level lasers but why should I choose either over the other?

Well, it depends on your budget and preference. If you want something quick then a 3 level laser may be ideal for you. However, if you prefer results faster then a 4 level laser might be right up your alley.

Beneficial effects and biological effects when using 3 and 4 laser level When choosing between 3 and 4 level laser, you must consider the benefits and risks associated with them.

Here are some things to keep in mind:

  • Treating darker hairs first – When performing laser hair reduction, it is important to start with lighter colored hairs first. Darker hairs tend to grow back thicker so starting with those makes sense.
  • Reducing redness – Some people experience temporary reddening after laser hair removal. This usually goes away within 24 hours.

Does laser levels produce sufficient energy?

The level energy of laser devices varies depending upon its wavelength. The most common wavelengths that are used by medical grade lasers are 810nm, 1320nm and 1470 nm.

These three types of lasers emit varying amounts of energy at various depths.

When selecting a laser device, make sure that it provides enough energy to penetrate through all layers of the epidermal cells.

Light energy and non-radiation energy are also being produced by this type of laser.

The atoms from energy will cause damage to the cell membrane and destroy the melanin pigment inside the follicle.

What does “non-radiation” mean?

Non-Radiation means that there will not be any radiation or heat generated inside the body.

This is because the laser beam travels only along the surface of the skin without penetrating into the tissue below.

Low-level laser therapy for traumatic brain injury 

Low-level laser therapy (LLLT) has been used in medicine since the 1950s, when it was discovered that low-level infrared light could be used to reduce pain.

LLLT uses short pulses of light at specific wavelengths to stimulate cells without damaging tissue. LLLT may have an analgesic effect on various types of pain, including headaches, migraines, fibromyalgia, arthritis, and neuropathy.

In recent years, research has found that LLLT can help with sports injuries, healing wounds, treating muscle spasms, and improving overall health.

Laser treatment now a day's are use for many kinds of health care problems such as acne, wrinkles, cellulite reduction, weight loss etc..

How does low-level light therapy work?

Light travels through most materials, so even though the wavelength of red light is invisible to humans, it still passes through our bodies.

This means that red light can penetrate deeply enough to reach tissues below the surface of the skin.

When applied directly to the body, red light penetrates the epidermal layers of the skin, stimulating cell growth and blood flow.

Their are some adverse side effects and some clinical effects that can occur after using this type of treatments.

What are the benefits of low level laser therapy?

Red Light Therapy works by increasing circulation and oxygenation of the affected areas. The increased circulation helps remove toxins and waste products from damaged or inflamed tissue.

Increased circulation increases the delivery of nutrients to the injured area, helping repair damaged tissue.

It stimulates collagen production, making new healthy connective tissue. Red light therapy speeds wound healing and reduces inflammation.

The rate of atoms with continuous wave of light irradiation can increase the number of mitochondria within the cells. Mitochondria produce ATP which provides energy for cellular functions.

This process leads to more efficient metabolism and improved function of all organ systems.

There are several studies showing positive outcomes of low level laser treatment:

1. Pain relief - In one study, patients who received low level laser therapy experienced less pain during dental procedures compared to those receiving no treatment.

2. Can cure benign skin tumors - A small pilot study showed that low level laser therapy reduced the size of basal cell carcinomas, squamous cell carcinoma, actinic keratosis, seborrheic keratoses, and Bowen’s disease.

3. Reduce scar formation - One study showed that low level red light significantly decreased hypertrophic scars following burn surgery.

4. Improve athletic performance - Athletes treated with low level laser reported significant improvements in their ability to perform physical activities.

5. Tissue repair for having anti-bacterial and anti-inflammatory effect - Low level lasers were shown to be effective against bacteria causing infections like MRSA. It also had an anti-inflammatory action.

6. Treating chronic fatigue syndrome - Patients suffering from CFS saw improvement in symptoms when they used low level laser therapy daily over two weeks.

7. Treatment of diabetes mellitus - Studies show that low level laser therapy improves insulin sensitivity and glucose tolerance in diabetic

8. Basic fibroblast growth factors - Fibroblasts are responsible for producing extracellular matrix proteins such as collagens, elastin, proteoglycans, glycosaminoglycan, etc.

They play a key role in maintaining normal structure and function of various organs including heart, lungs, liver, kidneys, bones, muscles, eyes, brain, nerves, joints, teeth, gums, hair follicles, sweat glands, and many others.

9. Stimulate bone marrow stem cells - Bone marrow contains spontaneous emission and stimulated emission of photons at 635 nm wavelength.

This results in stimulation of hematopoietic stem cells leading to enhanced proliferation and differentiation into blood forming elements.

10. Increase immune system response - LLLT has been found to stimulate macrophages, natural killer cells, neutrophils, lymphocytes, dendritic cells, monocyte/macrophage lineage cells, mast cells, eosinophil granulocytes, basophiles, plate and endothelial cells.

This increases phagocytosis, chemotaxis, degranulation, superoxide generation, cytokine release, antibody synthesis, antigen presentation, complement activation, and other immunological responses.

Brain-derived neurotrophic factor

BDNF is a protein that functions in the brain to regulate nerve growth, survival, and synaptic plasticity.

The biological mechanism by which BDNF exerts its effects on neurons involves binding to tropomyosin receptor kinase B receptors located on the surface of target cells.

This triggers intracellular signaling cascades resulting in changes in gene expression and cellular physiology.

These include increased neuronal excitability, synapse formation, axonal outgrowth, neurogenesis, angiogenesis, myelination, and protection against apoptotic stimuli.

The cellular mechanisms also involve regulation of calcium homeostasis, cell cycle progression, mitochondrial biogenesis, metabolism, energy production, oxidative stress resistance, DNA damage repair, autophagy, inflammation, and neurotransmitter secretion.

In addition to these physiological roles, BDNF plays important roles in pathological conditions associated with neurological disorders, cancer, cardiovascular disease, metabolic diseases, aging, and wound healing.

Low-level laser (light) therapy (LLLT) in skin: stimulating, healing, and restoring

LLLT has been used for many years in medicine, dentistry, and cosmetics. Laser light can be absorbed by living tissue and converted into heat energy, causing local heating.

This causes biochemical reactions that stimulate cell growth and repair, and can reduce inflammation.

Today Anti-aging, skin rejuvenation are becoming more popular among people who want to look younger and healthier.

There are several ways to use lasers in dermatology. The most common way is using low power density lasers like red or infrared wavelengths.

Skin tone and texture improve as collagen fibers become thicker and stronger.

Laser treatment may help treat acne scars, stretch marks, sun spots, wrinkles, pigmentation problems, rosacea, psoriasis, eczema, warts, moles, tattoos, and even some types of cancers.

It's not just about treating your skin; it’s about improving overall health.

Dosimetric parameters and correct parameters for LLLT in skin

Dosimetric parameters and wavelength selection depend upon the type of application being performed.

For example, if you're going to perform an ablative procedure such as fractional CO2 resurfacing, then you need to select a specific wavelength based on what depth you wish to achieve.

If you're performing nonablative procedures such as microdermabrasion, then you would choose a different wavelength depending on how much exfoliation you wanted to do.

The affinity of transcription factors to their cognate response elements depends on the sequence specificity of each factor.

Transcription factors bind to short sequences called cis-elements within promoters and enhancers.

Cis-acting regulatory elements consist of two parts: A core promoter element and one or more upstream activating regions.

A UAS consists of multiple copies of a conserved hexameric motif known as the TATA box.

Each copy of this motif binds a single transactivator molecule.

What are some thermal effects and biphasic effects laser therapy?

Thermal effects are those effects which occur when light is absorbed by a substance and converted into heat energy.

Biphasic effects are when light travels through a medium and is reflected back to the eye. A number of therapeutic lasers use different wavelengths of light to produce these effects.

There are some cellular mechanism activation that occurs during photobiomodulation.

Photons interact directly with chromophores inside cells, leading to changes in gene expression.

These interactions include direct excitation of intracellular molecules, indirect stimulation of membrane receptors, and modulation of cellular metabolism.

Thermal damage are being minimized because we have developed new technologies.

We now know that there are other mechanisms involved in the biological responses induced by PBM.

In addition to its ability to penetrate deep tissues, another advantage of NIR over visible light is that it does not cause significant absorption by water.

NIR also penetrates deeper than UV radiation, so it can reach areas where UV cannot.

How long does laser work?

Most patients see noticeable improvement in just two weeks. Most patients report seeing full regrowth in four months.

Magnification in brain tissue is also control by the same genes.

This means that they could be used to develop treatments for diseases like macular degeneration.

However, many people don't realize that the human body has several natural healing systems that can repair itself without any medical intervention.

When our bodies heal themselves, it happens at a rate of approximately 1% per day.

Our immune system works hard to keep us healthy. It fights off bacteria, viruses, fungi, parasites, cancerous tumors, and foreign substances.

Low-level laser (light) Therapy and its mechanism of action

LLLT is a form of non-invasive, non-ablative, non-thermal laser therapy. It is used to treat a variety of conditions including acne, aging skin, and wrinkles.

It works by stimulating collagen production and inhibiting matrix metalloproteinases. It is effective for treating acne and scarring.

Radiant exposure can affect our skin tone, The chromophores in skin cells can absorb photons from the sun's rays.

The result is an increase in melanogenesis, causing your skin to become darker. This process is referred to as photoaging.

Laser treatment may help reverse this effect.

As you age, your skin loses elasticity and becomes thinner. Laser therapy helps restore lost volume and firmness.

Your skin will look younger and healthier after using LLLT.


I'm Elliot Higgins the Founder of multiple hardware stores around the UK. I love wood and wood working. Watching a fine piece of pine or cedar turn into a work of art is extremely satisfying. The one thing I love more than woodworking is the toys that we use! On HandyToolsHome.com; we bring you information and reviews on all kinds of tools.

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