Over time, brow definers can become quite blunt. The bluntness makes it challenging to create those sharp, flawless outlines. Hence, one should know about sharpening the brow definer.
Similar to an eyeliner pencil, you can sharpen a brow pencil using a dedicated makeup sharpener. But, if you have a pen or other type, do not attempt this method as tt will ruin the angled tip. Instead, slightly wipe the tip on a piece of paper. Use minimal pressure to avoid mushing the definer.