Anti-wrinkle injections use a purified form of botulinum toxin to soften the lines that form when we make expressions, such as frown lines between the brows, forehead lines and crow's feet around the eyes. A tiny amount is injected into specific muscles, temporarily relaxing them so the overlying skin creases less. Results are subtle rather than dramatic, and each treatment is tailored to your face, your muscle strength and the look you want. In the UK, botulinum toxin is a prescription-only medicine.