The Missing Puzzle Piece in Your Retention

Posted by Christin Hor on

Have you ever wondered why a full set of eyelash extensions only lasts 6-8 weeks, even though a natural lash cycle can span 3-4 months? Let's delve into the science behind this fascinating aspect of lash extensions.

The Basics: Lash Growth Phases

To understand why lash extensions have a finite lifespan, we first need to understand the three phases of natural lash growth:

  1. Anagen Phase (Growth Phase): This is when the lash is actively growing. 

  2. Catagen Phase (Transition Phase): In this phase, the lash has fully developed, and the blood supply to the hair follicle is cut off. This phase lasts approximately 2-3 weeks.

  3. Telogen Phase (Resting Phase): The lash is now in a resting state, waiting for a new baby lash to grow and push it out. This phase lasts between 6-9 weeks.

Calculating Extension Lifespan

If we consider that we only apply extensions to adult lashes in the catagen phase, which lasts 2-3 weeks, and add the telogen phase of 6-9 weeks, we get a total of at least 8 weeks. This suggests that a full set of lashes should ideally last around 8 weeks.

However, in reality, many factors can influence the lifespan of lash extensions. Factors such as application technique, aftercare, and the quality of products used can all play a role in how long extensions last.

The Missing Puzzle Piece: Adhesive Retention Time

One often overlooked factor that affects the lifespan of lash extensions is the retention time of the adhesive. The retention time refers to the time from when the glue hardens to when it breaks down naturally.

For example, our adhesive has a retention time of 7-8 weeks, meaning that under ideal conditions, a set of lashes can only last as long as the adhesive remains intact. Most adhesives on the market have a retention time of 5-6 weeks, which can limit the lifespan of lash extensions.


Understanding the natural growth cycle of lashes and the role of adhesive retention time is crucial for both lash technicians and clients. By knowing the factors that influence lash extension lifespan, technicians can provide better service and clients can enjoy longer-lasting lashes.

Do you know the retention time of your adhesive? 

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