Liquid fillers are substances used in cosmetic procedures to enhance facial volume and smooth out wrinkles. They are typically made from materials like hyaluronic acid, which is naturally found in the body, making them safe and effective for various applications. Liquid fillers can be injected into areas such as the cheeks, lips, and under the eyes to create a more youthful appearance. These fillers provide immediate results and can last from several months to over a year, depending on the type used. Common brands include Juvederm and Restylane. The procedure is minimally invasive, often requiring little to no downtime for recovery.