Fillers are generally categorized by their composition and longevity: Facial Injectable Fillers in Aesthetic Medicine - PMC - NIH
The primary goal of contemporary filler treatment has shifted from simply filling isolated wrinkles (like nasolabial folds) to a "whole-face approach" that addresses the underlying causes of facial aging, such as fat atrophy and bone resorption.
Injectable fillers have become a cornerstone of modern aesthetic medicine, providing a minimally invasive alternative to traditional surgery for facial rejuvenation and volume restoration. Overview of Modern Fillers