Yes, eyebrow extensions do exist. Eyebrow extensions are a cosmetic procedure similar to eyelash extensions. They involve attaching individual eyebrow-shaped synthetic or natural hair strands to the existing eyebrows to create a fuller or more defined look. This procedure is often used to fill in sparse eyebrows or to achieve a specific eyebrow shape. It's typically performed by trained beauty professionals and can provide a temporary enhancement to eyebrow appearance. However, like eyelash extensions, they require maintenance and touch-ups to keep the desired look.