Which factor can affect how long eyelash extensions last?

The longevity of eyelash extensions is significantly influenced by the humidity of the environment. Humidity can impact the curing time of the adhesive used to bond the extensions to the natural lashes. In a high-humidity setting, the adhesive may cure too quickly, leading to a weak bond and potentially causing the extensions to fall off sooner than intended. Conversely, in low-humidity environments, the adhesive may not cure properly, which can also affect the lasting power of the extensions. Therefore, maintaining optimal humidity levels during the application process is crucial to ensure that the extensions adhere properly and last as long as possible.

While other factors like the client's age, the products used on natural lashes, and the length of the extensions can influence the overall outcome and appearance of the lash extensions, they do not have as direct an effect on how long the extensions will actually stay attached compared to the environmental humidity during and immediately after the application.