No, not when applied and maintained correctly! When applied by a skilled lash artist, lash extensions are perfectly safe and should not cause any damage to your own natural lashes. Lash extensions will grow out with your natural lashes, and shed with the natural lash when it is at the end of its growth cycle. You should take on board the advice given by your lash artist regarding lash styles that your own natural lashes can safely be suitable for. Lash extensions that are too thick, heavy or badly applied are the most common causes of damaged natural lashes. You should also follow aftercare given by your lash artist, as poor lash hygiene or picking at your lash extensions can also cause damage to the natural lashes.