What is the best length and curl for eyelash extensions?

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As a lash tech, you should have access to a selection of eyelash extensions. This way, you’ll always be prepared to work with clients who require a variety of lash extensions. You will be able to determine which extension to utilize during your client appointment depending on the curl, length, and thickness of the hair.

Bear in mind that clients will have varying preferences and will desire a particular style of look or set. However, do not be alarmed! The following are the most popular eyelash extensions that the majority of your clients will choose.

The various types of lash curls used in eyelash extensions

Due to the growing demand for eyelash extensions, the necessity for various variations to accommodate various eye shapes arises. There are numerous eyelash extensions available depending on the curl type. It’s crucial to realize that manufacturers may label their curls differently and have tiny variances in the overall curvature, although these variations are easily discernible across the majority of manufacturers.

As a lash tech, the following are the most prevalent curls you should be familiar with when purchasing eyelash extension supplies:

B Curl

B curl lash extensions are really straightforward but add a touch of curl. Not excessively overdone nor excessively flat. Natural with a delicate curl, the finished effect is natural. They are perfect for clients who have naturally straight or slightly upward-pointing eyelashes.

Additionally, lash artists utilize them for inner corner lashes. They are not recommended for people with slanted eyes or natural lashes.

C Curl

Also referred to as the common curl, C curl lash extensions have a curl that is comparable to or identical to that of natural lashes. They are great for clients who naturally have a tiny curl in their lashes.

If your client’s natural lashes are straight, using a C curl will give them a doll or open eye impression. Meanwhile, if your client’s lashes are somewhat downward oriented, a C curl will impart a small lash lift.

However, if your client’s lashes are severely inclined downward, do not utilize a C curl; a more pronounced curl will be required. I recommend curling your hair with a CC or D curl.

CC Curl 

The CC curl is a type of curl. It’s a good compromise between a C and a D curl. This curl is similar to the C curl but ends with the dramatic flair of a D curl.

This curl is excellent for adding lift to the outer edges of your set, particularly on clients with downward or drooping eyes.

D Curl 

D curls provide drama and include a visible curl. If your client’s natural lashes are straight or downward angled, opt for a D curl.

When you apply D curl lashes to clients who have natural lashes with a downward slant, the effect is one of an open eye. When applied to clients with natural lashes that are horizontally angled, it creates a charming doll eye impression.

It is critical not to utilize D curl lash extensions on customers who have natural lashes with an upward angle and hooded eyelids, since this may poke their eyes (depending on the length you use).

J Curl 

J curl lashes offer the most natural curl of all the lashes on our list and are a must-have for your lash supplies. This is perfect for people who have natural lashes that are straight or upward-pointing. If your customer desires a more natural look on a daily basis, the J curl should be explored.

Avoid using J curl lash extensions on customers who have severely hooded natural lashes.

L+ Curl Lashes

On our list, L curls have the most curl. It is flat at the base and abruptly curls upward. It is recommended for people who have deep-set eyes, hooded eyes, or droopy eyelids.

If your customer desires drama, you may choose to explore L+ curl lashes. Additionally, it has the most noticeable effect on the eyelids.

However, avoid using L+ curls on clients who have natural lashes with a downward angle.

Selecting an eyelash extension style and length

When choosing the length and diameter (thickness) of your client’s eyelash extensions, you must first assess the condition of their natural lashes. A heavy set of brittle or unhealthy natural lashes will result in breakage. This is detrimental to the natural lashes of your client.

Following are some recommendations to assist you in guiding your customer as their lash tech:


Clients frequently express a desire for longer lashes. However, each client’s natural eyelash condition will dictate the optimal and most practical length to deal with.

Bear in mind that it is your job to educate and inform your clients about why a particular length is more appropriate for their natural lash condition. It is critical to safeguard your client’s natural lashes and to avoid early fallout or damage to them by selecting a length that does not interfere with their growth cycle.

For clients who have hooded or droopy eyelids, you might opt for somewhat longer lash extensions than their natural lashes. Because when they open their eyes, their eyelashes tend to disappear beneath their eyelids.

Bear in mind that the more pronounced the curl of the lash extensions, the shorter they appear. Make sure to buy the appropriate length of eyelash extensions for the curl type you intend to utilize.

Diameter or thickness

The set that your client desires will often dictate the diameter that you use. For classic sets, 0.15 extensions are required (in exceptional circumstances, 0.10); for volume sets, 0.07, 0.05, or 0.03 extensions are permitted.

When determining the diameter for volume, several aspects must be considered: the amount of volume desired by the client, the health of their natural lashes, and the number of extensions per fan. Although clients with healthy lashes may sustain more weight and larger fans, richer volume sets demand the use of thinner extensions such as 0.03’s.

For Classic Sets, you’ll want to compare your client’s natural lashes to the thickness of your lash extensions. This is the most accurate method for determining the thickness or diameter of the eyelash extensions you will use on your client.

Lifestyle and preference

People are becoming increasingly aware of the value of the physical activity. Many people question if they can have eyelash extensions if they are always running, swimming, or working out. The quick answer is that they very certainly can!

As a lash tech, it is your obligation to educate your clients about the fact that lash extensions are not as delicate as they believe. Make certain to inquire about the types of workouts your clients perform and how frequently they perform them. Additionally, it is your responsibility to educate them on how to properly care for their lashes following an application with the right lash products to prevent their extensions from becoming damaged and falling out prematurely.

For instance, if a customer enjoys running, jogging, hiking, or anything else that causes them to sweat, it is critical to inform them not to get their eyelash extensions wet 24 to 48 hours after the application. Following that, kids may begin exercising as long as they remember to wipe their eyelashes every day. Demonstrate the value of a daily aftercare program.

Avoid getting your eyelashes wet for 24 to 48 hours after application if you are a swimmer. This is critical. And, regardless of what happens, remind your clients not to touch their eyes. They can safeguard their eyes by wearing goggles.

When selecting eyelash extensions, it is critical to consider your client’s lifestyle and interests. Always take into account their natural lashes before offering advice or initiating an application.

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