Anti-wrinkle and muscle relaxant injections are used to relax the muscles causing facial wrinkles. Over time, repeated muscle movements cause deep facial folds to form. Anti-wrinkle injections normally takes an average of 2 to 3 days to start working, although it may take a little longer for the full effects to be seen. The speed of action will depend on the strength of your facial muscles and your individual response to the injection.
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Anti-wrinkle injections relax facial muscles to reduce the appearance of lines and wrinkles. It usually treats:

By relaxing these muscles, anti-wrinkle injections achieve a younger-looking, rejuvenated appearance. These treatments can successfully smooth wrinkles caused by muscle movement and even prevent these lines from worsening over time.
Common injection sites for addressing wrinkles and lines are: glabella (region between eyebrows), forehead, outer corners of eyes (crow’s feet), sides of mid-chin (for down-turned mouth), neck (for neck bands or visible cords)
Anti-wrinkle injections can also treat:

Facial asymmetry or other facial conditions that result from muscle action; this is called “facial shaping”