fig1

Figure 1. A: Botulinum toxin injection for forehead wrinkles and frown lines. Glabellar injections may be performed without treatment of the frontalis, but frontalis injections must always be accompanied with glabellar treatment to avoid brow ptosis. Volumes referenced are independent of neurotoxin variety and assume dilution as specified in the body of the text (i.e., 1 mL saline per 100 unit vial of Botox® or Xeomin® and 3 mL per vial of Dysport®); B: demonstration of injection technique whereby pinching and elevating the tissue protects the underlying neurovascular bundle. While these figures offer a guide, dosing may vary between patients according to their musculature and anatomy