Anti-wrinkle injections work by paralyzing or freezing muscles in place by blocking the activity of nerve signals in the injected areas. When the fluid is injected into the forehead, for example, the nerve signals to the forehead are blocked for a time period, preventing the muscle around that area from contracting. As a procedure that's only minimally invasive, Botox injections are a great way to smooth out or reduce wrinkles. Taking no more than a few minutes, Botox is injected using an extra fine needle so there's no pain involved in the injection process. Those who receive an anti-wrinkle treatment session at a spa or dermatologist's clinic can go about their day afterwards.