Anti-wrinkle injections are a popular cosmetic treatment used to reduce the appearance of facial lines and wrinkles. 1 These injections work by temporarily paralyzing the underlying muscles, preventing them from contracting and causing creases. 2 The most common substances used in these injections are botulinum toxin, such as Botox or Dysport. 3 Botulinum toxin is a neurotoxin that blocks the nerve signals to the muscles, causing them to relax. 4 While these injections are generally safe and effective, it's important to consult with a qualified healthcare professional to determine if they are right for you and to discuss potential side effects.