The market includes a range of biocompatible injectable materials — such as hyaluronic acid (HA), calcium hydroxylapatite (CaHA), poly-L-lactic acid (PLLA), and polycaprolactone (PCL) — selected based on treatment goals, durability, and clinician preference. https://www.databridgemarketresearch.com/reports/global-cheek-depression-injectable-fillers-market