Disposable lip brushes are single-use cosmetic tools used for applying lipstick or other lip products. They are typically made with a small brush head, made of synthetic bristles, attached to a short handle, and are designed to be used once and then disposed of. These brushes are convenient and hygienic, as they prevent the spread of bacteria or product buildup that can occur with reusable brushes. They are ideal for makeup artists or for personal use, especially for on-the-go touch-ups, or for anyone looking to maintain a clean and healthy makeup routine.