Classic eyelash extensions typically require infills or touch-ups every 2-3 weeks to maintain their fullness and appearance. During a 2-week infill appointment, the lash technician will carefully remove any outgrown or loose extensions and fill in the gaps with new extensions. On average, a person can naturally lose between 1 to 5 eyelashes per day. Therefore over 14 days you could loose up to 70 lashes, this is why it's important you maintain 2 weekly infills to ensure your lashes look full and their best. PLEASE NOTE: This is a 2 week infill appointment, if your lashes are over 2 weeks and 4 days you will need to book a classic infill 3 week appointment.