The general rule of thumb is to replace your lace base every 4 to 6 weeks. As the lace ages, it becomes more prone to tearing and looks less natural. Higher quality lace bases like HD lace and Swiss lace may last 6-8 weeks with proper care. If your lace base shows signs of damage or isn't looking natural anymore, it's best to replace it. Your stylist can help determine when it's time for a new base.