Botulinum Toxin A is a modulator of nerves and relaxes muscles in the face, to reduce wrinkles. It usually lasts around 3 months, depending on the area treated.  Results begin at 3 days and the final result is at around 7 days. Common areas are the forehead, frown and crow’s feet around the eyes. These injections can also be used to reduce the grinding of the teeth, which can cause headaches.  You can also reduce sweating armpits with these injections.