Actually, this is more of a personal question. The answer is only as long as you want to use them. Natural lashes usually take a couple of weeks to grow and tend to thin out as they grow. As tempting as they may be, buy one and get one free, as eyelash glue might not be right for you.
As we mentioned earlier, glue for eyelash extensions can expire within 3 to 6 months, even if it has never been opened. Once opened, you have 1 month to use the glue.
Eyelashglue is an essential part of keeping false eyelashes attached to the eyelids, but in this case, less is more. But don't let the name confuse you, as individual lashes are actually a group of single-eyelash hairs (about five to ten) that have stuck together.
Like eyelash adhesive, heavy mascara can build up on false lashes over time, making them too thick and damaging the shape and quality of the lashes. Eyelash extensions are made of PBT, the material itself does not expire, but over time, eyelash curls may lose their shape. Although it's very tempting to go straight to bed without touching makeup remover, sleeping with false eyelashes is never a good idea. He recently conducted an experiment in which he tried to keep his eyelashes the same length but put on artificial eyelashes.
First, soak a cotton swab in an oil-based makeup remover (like this one) and run the bud along the lash line to remove the glue. Simply use tweezers to remove the dried glue from the lashes after removing them and store them in their original case until you want to use them again. This deterioration of eyelash glue continues in its “progress” phase from the moment the eyelash glue is bottled, since air cannot be prevented from entering the bottle. In general terms, when the glue shows a change in consistency, performance or separation of ingredients, it's time to open a new eyelash adhesive.
Currently, the best material available for an eyelash glue bottle is so-called PE, a breathable plastic that allows a minimum amount of air to enter the eyelash glue bottle. Remember that your lashes may look fresh and flawless, but you'll be susceptible to irritation from all the glue. I used to apply false eyelashes from time to time, until I increased my lashes with the help of the Cherish Lash ???? serum. For now I look like a queen, so false ones are not necessary, but sometimes I wear the most decorative and elegant ones.