First of all, what exactly are eyelash extensions? They are simply synthetic eyelashes that are applied directly to natural lashes to increase their volume and density. These lashes are made of silk, mink, or microfiber.
These products require rigorous hygiene, both during application and maintenance. The lifespan of these extensions depends on the lifespan of the eyelashes to which they are applied. This is generally a little over a month, or even two if the natural lashes are strong.
Selecting the right eyelash extensions
To choose the right eyelash extensions to apply to your client, in addition to knowing her preferences, you should consider her face shape and eye shape. By observing her features, you will be able to determine what will be most suitable for her beauty enhancement.
Don't hesitate to advise her and suggest something else if you think her choice isn't what will flatter her most!
It's important to remember that if your client's natural lashes are short and thin, choosing extensions that are too long or too thick would be a mistake. Simply because the extensions won't last over time.

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Applying extensions with the traditional lash-by-lash method
There are many different methods for applying eyelash extensions. However, the most common and the one we are most proficient in in France is the traditional lash-by-lash method.
Lasting a minimum of one hour, the lash-by-lash application allows, as its name suggests, to apply the extensions one by one to the real lashes. This is undoubtedly the most natural method.
Let's now discover together how to proceed.
Necessary equipment
Primer: This will allow you to properly prepare the lashes so that the extensions adhere correctly.
Disposable spoolie brushes: Just as essential, spoolie brushes will allow you to separate the lashes for extension application and cleaning.
Eyelash extension remover: To easily remove failed or damaged extensions, it is essential to use a removal cream!
Eyelash extension glue: An indispensable tool for applying extensions (to be stored in a dry place away from light). Glues generally last 2 to 6 months after opening the bottle.
Eyelash extensions: We advise you to choose extensions of 9 to 11 mm in length and 0.20 mm in thickness. These are generally the most commonly used.
Under-eye gel patches: Gel patches will protect the skin during application as well as the lower lashes.
Surgical tape: An essential tool to protect the skin and prevent upper lashes from touching lower lashes.
Eyelash extension tweezers:
- A straight eyelash extension tweezer to place the lashes.
- A curved eyelash extension tweezer to isolate the client's natural lash, allowing you to apply the extension.

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1 – Lash preparation
First, to apply eyelash extensions, prepare the surface so that it is perfectly clean before starting to work. Have all the equipment mentioned above at hand.
Hands cleaned and sanitized, let's get started! Impurities risk creating a protective barrier that will prevent the glue from adhering properly, so we advise you to take the time to thoroughly clean your client's eyes.
- Remove your client's eye makeup, avoiding oily products; using a makeup remover water is the best thing to do.
- Apply primer to the lashes.
- Apply under-eye gel patches to protect the skin and lower lashes.
2 – Applying eyelash extensions
This is the longest and most delicate step. You will need time and both hands for the application! Suffice to say, if you are ambidextrous, it will be very useful. Above all, ask your client to keep her eyes closed during the application, it is very important!
- Brush the lashes and separate them from each other using disposable spoolie brushes.
- With your secondary hand, isolate the first lash on which you want to apply the extension.
- Your dominant hand will then select an extension with the tweezers and then immerse the tip in the glue (don't hesitate to remove excess glue: a small dot of glue must remain on the base of the lash, this is important).
- Glue the extension to the same proportion of glue you have (so the base normally) on the client's lash.
In fact, the lash should be as close as possible to the skin, without touching the epidermis or the root of the real lash, which could cause discomfort.
- Using the drying bulb, you can then dry the glue much faster.
This way, you can remove the lash if there's an error, using the lash extension remover.
- We advise you to work symmetrically. That is, to do one lash on each eye to avoid unpleasant surprises.
3 – After eyelash extension application
You've finished applying the eyelash extensions and you think you've succeeded? Good job! Now it's time to check that everything is fine and that you can complete the operation.
- Once you have finished applying the lashes, use a spoolie brush to brush the lashes.
- Check that the extensions are not stuck to each other or to the patch.
- If you realize you made a mistake, it's not a big deal! Don't stress. Go back. Use the lash extension remover to redo the lashes that were done incorrectly.
- If all is well, gently remove the gel patches previously placed around the eyes.
4 – Precautions after extension application
Your work is done, now it's time to advise your client who might make a mistake that will cost her freshly applied extensions.
- Still avoid using oil-based products that could dissolve the glue (especially makeup removers).
- Avoid cotton, which could leave white particles among the lashes.
- Do not pull the lashes, of course.
- Avoid all contact with water for 24 hours after application so that the glue sets properly. Similarly, avoid steam for 48 hours after application.
- Use a quality mascara suitable for eyelash extensions.
Eyelash extension maintenance
Your work doesn't stop there! To maintain your client's eyelash extensions, she will need to return in 3 or 4 weeks so you can touch up all the lashes.
This involves removing extensions that are coming loose and replacing them with new ones to fill in any gaps.