Eyelash Extensions: The Ultimate Guide

By PMUHub Editorial Team| Last updated on May 13, 2024

PMUHub brings you the ultimate guide to everything you ever wanted to know about eyelash extensions – types, styles, costs, risks, maintenance, and more!

Eyelash Extensions: The Ultimate Guide by PMUHub

Image source: Instagram @bybobbis

Lash extensions are a popular way to enhance the lashline and significantly cut down the time you spend getting ready in the morning as you won’t need any eye makeup – that’s right, you’ll look like you have mascara and even eyeliner on without even trying.

Here’s all the info on eyelash extensions, plus, our Editor-in-Chief Emily shares her experiences and gives you all the important tips to keeping your lashes eye-safe and picture-perfect!

Image Source: Original Image by PMUHub


WHAT ARE THEY: Lash extensions are semi-permanent fibers used to create the illusion of increased volume and length.

TYPES, STYLES & CURLS: They come in different materials and vary in length, diameter, and curl, which are essential in creating a specific lash style.

HOW ARE THEY DONE: Extensions are attached with lash adhesive to the top, the side, or the bottom of the natural lash.
THEIR LONGEVITY: Lash extensions can last up to 8 weeks, but generally require an infill at around week 3 to maintain their look.

MAINTENANCE: Lash extensions should be cleaned and brushed every day to keep their appearance.

SIDE EFFECTS: Lash extension side effects are rare and usually related to poor technique, improper maintenance, and allergic reactions to the lash adhesive.

THEIR PRICE: The cost of lash extensions varies depending on the location, technician, and chosen style. The average price in the US for a starter set is $100.

FAQ: Find answers to all your questions about lash extensions here!

Click on the topics for more info, or scroll down for the whole guide.

Ready to Get Eyelash Extensions?

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What Are Eyelash Extensions?

Lash extensions are semi-permanent fibers, applied to your natural lashes one by one or grouped into lash fans, to enhance their look. A semi-permanent adhesive is used to glue the extensions to each of your natural lashes, thus making them look longer and more voluminous.

Characteristics of Lash Extensions

Extension fibers come in many different lengths, diameters, materials, and curls that all together play an important role in creating the best lash look for each client. Let’s take a look at their most important characteristics:


Eyelash extensions can either be made of natural or synthetic materials. Natural lash extensions are most commonly made of mink fur, although they can be hard to find these days, and quite expensive.

Due to the nature of natural lash extension production and their price, synthetic lashes are most frequently used during lash appointments.

Length & Diameter

Lash extensions are not a one-size-fits-all kind of thing – technicians carefully choose the length and thickness (or diameter) of the extensions they place on your natural lashes.

It’s important to choose extensions that are not too heavy on the natural lash causing it to break, or too long for the client’s eye to avoid any irritation or poking.

lash extensions types based on lash curl, lash thickness and lash length


Lash extension curl is the angle at which the extensions bend and curl upward towards the eyebrow.

Curls can range from subtle to dramatic and depend on two factors – the growth pattern of the client’s natural lashes (whether they grow downwards, straight, or have a natural curve) and the chosen lash extension style.


Extension styles refer to the final look of your lash set. There are many popular lash extension styles that you can get, depending on your eye shape, so make sure to book with an experienced technician who will make this choice easy for you.

Explore lash extension styles here.

lashhoneyxom instagramImage Source: Instagram @lashhoneyxo

Our Editor’s Take on Lash Extension Benefits

I’m just in awe of how amazing my eyes look without any makeup. Eyeliner, mascara… who needs them?

Lash extensions helped speed up my morning routine, I always look put together with minimal effort, plus, they stay intact during intense workouts. No more makeup running down my face at the gym!

About the Lash Extension Treatment

The lash extension treatment is completely pain-free and very straightforward. However, there are some steps that the client should follow before walking into their appointment to maximize efficiency.

How To Prepare for Eyelash Extension Treatment?

The preparation for a lash extension appointment requires certain steps:

  • Don’t wear makeup to the appointment. Clean your face and it is a good idea not to wear mascara for at least 24h before the treatment.
  • Take off your contact lenses, if you wear them.
  • Don’t curl your lashes before the treatment.
  • Avoid oil-based products on and around the eyes.
  • Wear comfortable clothes, because you will be lying down for 2 hours.

Extra tip: Try not to drink coffee before the appointment. Coffee and other caffeinated beverages can make your eyelids twitch and make it hard for the technician to be precise.

What Does the Lash Extension Treatment Look Like?

The lash extension treatment lasts 1-2 hours. Here’s what to expect step by step:

Step 1: Cleaning

The treatment starts with the technician cleaning your lashes and the area around your eyes, making sure that there is no sebum or makeup residue.

Step 2: Taping & Mapping

Once everything is prepped, the technician will tape down your bottom lashes and protect the eye area, making the upper lashes easily accessible.

They will use tape and undereye patches to map out the length, curl, and diameters needed to create your chosen lash style.

Step 3: Application

Once mapping is done, they will use specialized tweezers to apply each lash extension, one by one, to your natural lashes and bond them with a professional lash glue.

Step 4: Final Touches

As soon as the extensions are cured and bonded with your natural lashes, the technician will remove the tape, clean your lashes, and brush them thoroughly to check for any strays.

@thelasheffect Hybrid Wispy Set ✨ #lashextensions #longislandlashtech #nyclashtech #fyp ♬ Play For Keeps – Runzo

How Long Do Lash Extensions Last?

Eyelash extensions technically last 6-8 weeks, without a fill-in. That is the length of the growth cycle of your natural lashes at the end of which they will gradually fall off.

Starting from week 3 you will experience some noticeable sparseness which can lead to an imbalanced look – that’s where lash infills come into play. Infills prolong the look of your extensions and are more time and cost-effective than always getting a new lash set.

Our Editor’s Take on Lash Extension Longevity

In my experience, shedding starts in the first few days post-treatment. However, noticeable shedding and sparseness began at week 2, which led me to schedule an infill appointment the following week.

Maintenance & Aftercare

Your new lashes will only be as good as the care you put into maintaining them. The rules of lash extension aftercare are pretty simple but important to follow regularly to avoid premature shedding. Here are the most important steps to follow:

  • Don’t get your lashes wet in the first 3-4 hours post-treatment.
  • Avoid long showers, steam, swimming, and excessive sweating in the first 24 hours.
  • Avoid rubbing your eyes and pulling on your lash extensions.
  • Try to sleep on your back to avoid breaking or bending your lashes.
  • Don’t use a lash curler or waterproof mascara on your lashes.
  • Don’t use oil-based makeup remover or other oil-based products on or around your eyes.

Lash extensions are generally low maintenance. You need to clean them regularly with lash shampoo or micellar water, and brush them with a clean spoolie once they’re dry to keep them untangled.

If you’re unhappy with the way your lashes look and you want to remove them, the best (and safest) thing to do is to wait it out until they naturally fall off. Remember not to pick or pull on your lashes as this can lead to permanent damage of hair follicles.

If waiting seems too long, a quicker alternative is to book a professional lash extension removal with your technician.

lash extensions aftercare instructions

Risks & Side Effects

Eyelash extensions are an eye-safe treatment when done in a professional setting by an experienced technician.

The only complications that may occur are related to improper aftercare and an allergic reaction to the lash adhesive used during treatment. If you have any allergies, inform your technician and do a patch test to check whether you will be allergic to the lash glue.

Make sure you clean your lashes every day to avoid sebum buildup that can lead to eye infections like blepharitis.

How Much Do Lash Extensions Cost?

The price of lash extensions depends on various factors such as your location, the demand of the technician, and which type of extensions you choose to get.

Expect to pay somewhere between $100 and $300 for a full-set lash extension treatment. The price of the lash extension refill ranges from $50 to $150.

Image Source: Instagram @lashes_de_anna

How To Choose a Lash Extensions Technician?

Choosing a good eyelash extensions tech is very important. If the technique is not done properly, it can lead to various complications, such as irritation, infection, and damage to your natural lashes.

So, do your research before you book an appointment. Check for online reviews, find someone experienced and if possible, visit the salon before you book and ask about the materials a technician uses.

Ready to Get Eyelash Extensions?

Browse our base of salons & find an artist for your treatment! 

FAQ About Lash Extensions

Do Lash Extensions Damage Your Natural Lashes?

The treatment is pretty safe and most technicians say that lash extensions don’t damage your natural eyelashes. However, they can become weaker and break if the extensions are too heavy or due to improper aftercare and maintenance.

Do Lash Extensions Hurt?

Lash extensions should never hurt your eyes. In fact, most people report falling asleep during the application process. Here’s what Emily had to say about it:

Going into the treatment I expected it to be quite uncomfortable, but I was pleasantly surprised, to say the least. It was quite a camping experience – I lay down in a very comfortable position and felt gentle brushing against my lashes and eyelids. The only bit of discomfort I experienced was tape removal from my under eyes – that’s it!

Can I Have Bottom Lash Extensions?

Yes, you can have lower lash extensions, if you like that look. Also, your lower lashes need to be long and thick enough to be able to have the extensions applied.

@saoudyy_lashes When your heads down and you acivate BEAST LASH TECH MODE😱😱😱😱✨✨✨🩵🩵 Work by Saoudyy🦋 Follow for more! #eyelashextensions #bottomlashes #jcurl #ccurl #classiclashes #naturallashes #lashinspo #wispylashes #lashtech #lashartist ♬ original sound – Saoudyy_Lashes

Can I Put Mascara on Eyelash Extensions?

Yes, but we don’t recommend doing so. It’s not advisable to wear mascara on volume or mega-volume lashes because it adds extra weight to already heavier lashes, which can lead to premature shedding.

More importantly, the formulation of the mascara itself plays a big role – if it’s waterproof, avoid it at all costs because it’s very difficult to remove and may result in you pulling out your extensions.

In general, mascaras require some effort to take off which can result in more fallouts than you would like so it’s best to skip it altogether.

Can You Wash Your Eyes with Eyelash Extensions?

Yes. However, when washing your face with lash extensions you should be gentle and make sure not to rub or pull on your lashes. Also, you should only wash your face with an oil-free cleanser as it won’t affect the lash adhesive bond.

Read our step-by-step guide to learn how to properly wash your face with lash extensions.


This guide is a result of 5+ years of studying and researching the beauty and PMU industry. The information comes from reliable sources: a number of experienced technicians, and a wide variety of references. A member of our team had the treatment done to provide an unbiased client’s perspective and experience.



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