Eyelash extensions take about an hour to apply, depending on the efficiency of the operator and the thickness of the eyelashes. Eyelash extensions are made by gluing artificial eyelashes to the body’s own eyelashes, and the operation needs to be very delicate in order to achieve realistic results. Before eyelash extensions, you need to clean your eyes first, then glue the eyelashes of one side of the eye upward on the special tool for fixing eyelashes, then glue the false eyelashes one by one on the real eyelashes, and the false eyelashes can not be completely glued to the root of the real eyelashes, but need to leave a little distance. After gluing one side of the eye, the same procedure is used for the other side of the eye. Therefore, eyelash extensions are very time-consuming. A skillful operator may be able to complete a pair of eyelash extensions in 40 minutes to an hour, while an unskilled operator may need an hour or more to complete the process. Since eyelash extensions require a large amount of glue application, eyelash extensions are not recommended for allergy sufferers and pregnant women to prevent the glue from coming into contact with the eyes or skin and causing allergies and other adverse reactions. Eyelash extensions need to be done at a regular facility. It is not recommended to have eyelash extensions frequently so as not to affect your eyesight. When eyelash extensions have adverse reactions, it is recommended to seek medical attention.