I saw this and it turns out it's made entirely out of polymer clay! The lips and teeth are so disturbingly realistic. : r/polymerclay
Clay lips by chat14 on DeviantArt
Clay Pieces - Lips
Amazon.com : INTO YOU Matte Velvet Lipstick Lip Mud Soft Lightweight Smooth Lip Clay Mousse Non-Stick Lip Gloss for Lips and Cheeks : Beauty & Personal Care
How To Sculpt Lips-Tutorial | Sculpting clay, Sculpture clay, Polymer clay dolls