Botulinum toxin is produced by a specific type of bacteria. In higher amounts, it can be poisonous. However, only small, weaker doses of botulinum toxin are used to reduce facial wrinkles.
When botulinum toxin is injected, it blocks certain nerve signals that make muscles contract. The muscles relax, reducing unwanted wrinkles. This effect lasts about 3–6 months. After that, the muscles move again and wrinkles come back.
When you have botulinum toxin injected, your doctor may first rub an anesthetic cream on the area to numb it. Then he or she will inject the medicine into specific facial muscles. This only takes a few minutes, and can be done right in the doctor’s office. You will be able to continue your daily activities right afterwards.
About 3 days after the injection, you should notice some muscles starting to relax. After 1 week, you likely will see fewer facial wrinkles and lines. This effect wears off in about 3–6 months.