I do believe that wearing lash extensions can make your natural lashes healthier. When you wear make up every day and use a lash curler and then wipe your make up off every night, you are manipulating your lashes a great deal.
When you wear extensions, you do not rub them or twist them or break them like you can with a lash curler or even just mascara.
When new clients come to me now, I can often see their lashes improve from the first session.
The extensions are properly applied and client is cleaning their lashes daily, I believe the natural lashes have a better chance of being healthiest.