Most people typically need refills every 2 to 4 weeks to maintain a full look. The frequency depends on your natural lash growth cycle and how well you follow aftercare guidelines.
On average, your natural lashes have a lifespan of about 6 to 8 weeks. Since lash extensions are attached to your individual natural lashes, the extensions will fall out as the natural lash completes its cycle.
The density of your natural lashes also affects how quickly you’ll need refills. If you have a full set of healthy natural lashes, they may support extensions longer, while fewer or weaker natural lashes may require more frequent touch-ups.