In which stage of hair growth should eyelash extensions not be applied?

Eyelash extensions should not be applied during the telogen phase of hair growth. During this phase, which is the resting stage of the hair cycle, lashes are naturally shed, and the follicles prepare for new growth. Since the hairs are more vulnerable and in a state of transition, applying extensions can lead to premature shedding of both the natural lash and the extension, resulting in uneven and sparse appearance.

In contrast, the anagen phase is the active growth phase where lashes are the healthiest and strongest, making it the most suitable time to apply extensions. The catagen phase, which follows anagen, is a transitional stage where the hair begins to detach from the follicle but is still relatively stable compared to telogen. Cognition is not a recognized stage in hair growth, so it is irrelevant in this context. Understanding the characteristics of each phase helps ensure the longevity and health of both natural lashes and extensions.