Poison- Botulinum

Botulinum is a toxic type A and a Type b. They are derived from bacteria that block muscular nerve signals. Injecting very small amounts into specific facial muscles blocks the muscle's impulse. This temporarily weakens the muscle and diminishes the unwanted lines. Botulinum has been used to treat muscle disorder since the  1980. Some examples are lazy eye and uncontrolled blinking. It was pioneered by dermatologic surgeons for cosmetic use in 1987.

Botulinum toxin type A is specifically indicated for the lines between the eyebrows, and it also can be effectively used for "off-label" indications in other facial areas. Even though this is a poison it is very helpful to a persons life. One thing that the poison can't do is fix the smile lines around the mouth because muscle action in this area is needed for important functions such as eating and talking. 

After injection of the toxic it takes about 3 to 7 days after treatment for improvement. it generally last about 3 to 4 months. After that the effect gradually fades as muscle action returns. Some patients require more injection to make the effect last longer.

Any side effects are minimal temporary and typically relate to the local injection. Soreness or mild bruising may occur around the injection site. In some cases patients may develop weakness of muscles leading to temporary droopy brow or eyelid, but all these possible are mild effects.

Before Injection

After injection

http://www.aad.org/public/publications/pamphlets/cosmetic_botulinum.html