Eyelash Extension

What is the Optimal Eyelash Extension Length and Curl?

You should have access to a variety of eyelash extensions as a lash tech. This ensures that you’re always prepared to work with clients that require a range of lash extensions. During your client session, you will be able to select which extension to use based on the curl, length, and thickness of the hair.

Bear in mind that clients will have diverse tastes and may request a specific sort of look or set. However, do not panic! The following are the most often requested eyelash extensions by your clientele.

The numerous lash curls that are used in eyelash extensions

Due to the increasing demand for eyelash extensions, the need for a variety of modifications to fit different eye shapes arises. There are numerous eyelash extensions available, each with a distinct curl. It’s critical to understand that manufacturers may label their curls differently and may have little differences in the overall curvature, but these differences are easily noticeable across the majority of manufacturers.

As a lash tech, you should be familiar with the following curls while purchasing eyelash extension supplies:

B Curl

B curl lash extensions are quite simple to apply but provide a hint of curl. Not overdone nor too flat. The end result is natural, with a slight curl. They are ideal for clients who naturally have straight or somewhat upward-facing lashes.

Additionally, they are used by lash artists for inner corner lashes. They are not suggested for individuals who have slanted eyes or who have natural lashes.

C Curl

C curl lash extensions, also known as the common curl, have a curl that is equal to or identical to that of natural lashes. They are ideal for people who have a slight curl in their lashes naturally.

If your client’s natural lashes are straight, a C curl will provide the illusion of a doll or open eye. Meanwhile, if your client’s lashes are slightly downward-facing, a C curl will lend a slight lift to the lashes.

However, if your client’s lashes are excessively angled downward, a C curl will not be sufficient; a more pronounced curl would be required. I recommend using a CC or D curl on your hair.

CC Curl 

The CC curl is a variation on the curl. It’s an excellent cross between a C and a D curl. Similar to the C curl, but with the dramatic flare of a D curl.

This curl is wonderful for lifting the outer borders of your set, especially on customers who have sagging or downward eyes.

D Curl 

D curls provide drama by including a noticeable curl. Choose a D curl if your client’s natural lashes are straight or downward angled.

When you apply D curl lashes to customers who have naturally slanted lashes, the look is similar to that of an open eye. When applied to customers with naturally angled lashes, it produces the illusion of a lovely doll eye.

It is crucial to avoid using D curl lash extensions on consumers who have naturally arched lashes and hooded eyelids, since this may poke their eyes (depending on the length you use).

J Curl 

J curl lashes have the most natural curl of any lash on our list and are a must-have addition to your lash supplies. This is ideal for individuals who have naturally straight or upward pointing lashes. If your consumer prefers a more natural look on a daily basis, you should consider the J curl.

J curl lash extensions should not be used on customers who have significantly hooded natural lashes.

L+ Curl Lashes

L curls have the most curl on our list. It begins flat and abruptly curves upward. It is advised for those with hooded eyes, deep set eyes, or droopy eyelids.

If your customer is looking for drama, you may want to choose L+ curl lashes. Additionally, it has a particularly pronounced effect on the eyelids.

Avoid applying L+ curls on customers who have natural lashes that are angled downward.

Choosing the style and length of your eyelash extensions

When determining the length and diameter (thickness) of your client’s eyelash extensions, you must first evaluate their natural lashes’ condition. Breakage will occur with a heavy set on brittle or unhealthy natural lashes. This is damaging to your client’s natural lashes.

The following suggestions will aid you in guiding your customer as their lash tech:


Clients frequently express an interest in having their lashes lengthened. However, the ideal and most practical length to deal with will be determined by the client’s natural eyelash condition.

Bear in mind that it is your responsibility to educate and enlighten your clients about why a certain length is more suited to their natural lash condition. It is crucial to protect your client’s natural lashes and avoid premature fallout or damage by choosing a length that does not interfere with their growth cycle.

For customers who have hooded or droopy eyelids, you may wish to use lash extensions that are somewhat longer than their natural lashes. Because their eyelashes tend to vanish beneath their eyelids when they open their eyes.

Bear in mind that the more pronounced the curl, the shorter the lash extensions appear. Ascertain that you purchase the correct length of eyelash extensions for the curl type you wish to use.

Diameter or thickness

Often, the diameter that you use is dictated by the set that your client desires. Extensions of 0.15 (or, in exceptional instances, 0.10) are necessary for classic sets; extensions of 0.07, 0.05, or 0.03 are acceptable for volume sets.

When determining the diameter for volume, several factors must be considered: the client’s desired volume, the client’s natural lash health, and the quantity of extensions per fan. While customers with healthy lashes may be able to support more weight and larger fans, richer volume sets necessitate the use of thinner extensions, such as 0.03’s.

When performing Classic Sets, you should compare the thickness of your client’s natural lashes to the thickness of your lash extensions. This is the most precise approach for calculating the thickness or diameter of the eyelash extensions you will be applying to your client.

Lifestyle and preference

Individuals are becoming more aware of the importance of physical activity. Many people wonder whether they can get eyelash extensions if they are constantly running, swimming, or exercising. The short answer is that they most emphatically can!

As a lash tech, it is your responsibility to educate your clients about lash extensions and the fact that they are not as sensitive as people imagine. Ascertain the types of workouts your clients complete and the frequency with which they perform them. Additionally, it is your obligation to educate them on how to properly care for their lashes following an application using the appropriate lash cosmetics to avoid injury and premature lash loss.

For example, if a customer enjoys running, jogging, hiking, or any other activity that causes them to sweat, it is vital to warn them not to get their eyelash extensions wet 24 to 48 hours after the application. After that, children may begin exercising as long as they remember to clean their eyelashes daily. Demonstrate the importance of daily aftercare.

If you are a swimmer, avoid getting your eyelashes wet for 24 to 48 hours after treatment. This is critically important. Furthermore, regardless of what occurs, advise your clients to avoid touching their eyes. They can protect their vision by wearing goggles.

It is vital to consider your client’s lifestyle and hobbies while purchasing eyelash extensions. Always consider their natural lashes when advising or commencing applications.


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