Eyelash grows in its own life phase. Additionally, each lash has its own cycle, meaning that lashes fall out at different times. It rarely happens that natural lashes shed at once. If that happens, there is probably a serious issue with the woman’s health. If the lash extensions are taken care of in a proper way (no oils, no moisture exposure, no lash pulling or tugging) they should fall out at the same time when the natural lash does. The lash extensions’ adhesive is very strong so the bond between lashes should not break for at least 90 days. Due to using oil-based product or improper skin care routine, extensions can break and fall out earlier.