Dermal fillers are injectable medical aesthetic devices indicated for soft tissue augmentation, facial contouring, and the correction of volume loss associated with ageing. Most formulations are based on cross-linked hyaluronic acid, selected for its biocompatibility, viscoelastic properties, and ability to integrate within the extracellular matrix while attracting water to maintain tissue hydration. Dermal fillers are commonly utilised for mid-face volumisation, lip enhancement, jawline definition, and the treatment of nasolabial folds and marionette lines, providing immediate structural support with predictable, minimally invasive outcomes when administered by qualified practitioners.