Botox shots block certain chemical signals from nerves that cause muscles to contract. The most common use of these injections is to relax the facial muscles that cause frown lines and other facial wrinkles. Botox injections also are used to ease symptoms of some health conditions. It's not a cure.

The best time to start preventative Botox injections is in your mid-twenties or early 30s. Generally, you want to start the treatments before developing lasting lines. For some people, this timing may be later or earlier than for others.