What do Botox injections in lips do?

Botox is typically not injected into the lips.  Botox is a muscle "relaxer" and does not provide volume or fullness to the lips.However, Botox is routinely used around the lips to help smooth vertical lines and wrinkles in the skin surrounding the reddish portion of the lips.  Botox can also be used to help elevate the corners of a "downturned"  mouth that seems to be frowning.I hope this helps.

Any
use of BOTOX® in the lower face is technically an off-label use (not approved to
be marketed by the FDA). However, some surgeons use very small amounts of
BOTOX® to soften smoker’s lines, often in combination with an injectable
filler. Some oral surgeons may use BOTOX® injections around the lip area to
improve the appearance of a smile that looks too “gummy.” If you have either of
these concerns, be sure you only visit a highly experienced injector, as too
much product in the wrong place could negatively impact your ability to move
your mouth, including issues with speaking and eating.

Botox can help reduce the appearance of smoker's lines above the upper lip. In general, Botox is not injected into the lips. To add fullness to the lips, a filler such as Juvederm is used. This will add some additional volume, and yields a fantastic result when the injections are performed properly. I hope this helps, and I wish you the best of luck.