Once a technician finishes applying eyelash extensions, what is the first thing they must do as part of the post-service procedure?

After applying eyelash extensions, it is crucial for the technician to first check in with the client to ensure that the eyelash extensions feel comfortable. This step is fundamental in the post-service procedure, as it allows the technician to address any immediate concerns or discomfort that the client may feel right after the application. Ensuring client comfort is key to providing excellent service and can also help identify any potential issues with the application process or the product used.

By asking for the client's feedback on how the eyelashes feel, the technician creates an opportunity for open communication and shows that they care about the client's experience. If there are any issues, such as irritation or incorrect placement, this feedback allows for prompt adjustments or clarifications before the client leaves the salon.

In this context, the other choices, while important for overall service quality, follow after the initial check on the client's comfort. Informing the client about aftercare, cleaning the area, and even applying mascara are essential steps that contribute to the overall service, but ensuring the client's immediate comfort and satisfaction takes precedence right after the lash extension application.