No, your eyelashes will remain. Many clients who have worn these synthetic eyelash extensions over repeated applications have experiences no breakage nor eyelashes falling out. This demonstrates the importance of having a qualified technician, who is properly trained for professional application of the synthetic eyelashes and uses a superior product. Once you begin the cycle of synthetic eyelashes, it becomes important that the methods of application and the quality of the product is key to the health of the natural eyelash. A broken eyelash can take nearly two months to grow back. If your goal is to achieve beautiful, thick eyelashes, have a professional apply them.