“She was able to grow her eyebrows back, and it was really shocking,” Flowers– who is known herself for shaving and growing her hair back just as quickly– adds. From applying castor oil to ...

"People with naturally sparse, thin brows may never achieve complete regrowth or full-looking eyebrows. In general, it can take several weeks to several months for eyebrow hair to visibly grow back." ...

I've had ladies come in with Rihanna's eyebrows and it's taken three years for them to grow back. "And sometimes they just don't grow back at all if you've killed the hair follicle," she warns.