Every expression you make starts with a nerve releasing acetylcholine, the chemical messenger that tells a facial muscle to contract. Squint, frown, smile, or concentrate often enough and the skin above those muscles keeps folding along the same lines, until dynamic wrinkles form between the brows, across the forehead, and beside the eyes. Declining collagen and elastin deepen those creases further, and eventually they linger even when your face is at rest.
LETYBO is an FDA-approved neuromodulator built on botulinum toxin type A. Placed into a targeted muscle, it interrupts acetylcholine release at the neuromuscular junction, dialing down the contractions driving your wrinkles. Treated muscles ease while untreated neighbors keep working normally, so the skin above flattens, existing lines soften, and new creases are far slower to etch themselves in.