I got Dysport injected next to my nose 3 weeks ago and now my smile is gone! When can I expect it to start to fade? (Photo)

I am sorry to hear about your experience.  These situations certainly are frustrating.  The duration of time that the effects will persist can be quite variable.  To some degree this is related to the dose of dysport used.  If only a tiny dose was used the duration of effect may be quite short.  Unfortunately there are no exercises or "antidotes"

Unfortunately too many units were placed in the inappropriate locations making it change your smile. I suggest seeing a cosmetic dermatologist with experience in 3 months as this will take time to resolve. Best, Dr. Emer.