Jawline Botox Affected my Smile, Will Facial Muscle Exercise Help Get my Smile Back? (photo)

Yes, Botox may last for four months, but often, in active muscle mass, such as the masseter muscle used for chewing it does appear to wear off more quickly, rather than taking longer.  There have been some question if cold temperature can negate the effects of Botulinum toxin. There needs to be formal medical studies about this as a treatment to help reverse unwanted Botox results. An ice test can be used by neurologists to reverse the lowering of the eyelid in myasthenia gravis, a neurological condition in which the eyelid is affected. Exactly how the cold temperature improves this neurologic condition is unknown, and how it can be used to improve an unwanted Botox result is not yet worked out.

40 units per side is quite a bit. It does sound like your doctor planned on injecting most of the masseter muscle (instead of concentrating on the lower portion only), and if he or she injected high enough, may have effected the smiling muscles as well. Given that they tried to place most of the Xeomin into the masseter, it is likely that very little actually went into the smiling muscles, meaning that it will likely improve much sooner- maybe even 2 months. Unfortunately, there really is nothing (including exercise) that will help this come back sooner. Best of luck.