My nose has changed since I had botox for a gummy smile. What is the cause?

Without photos it is impossible to say what is happening but I would definitely return to your treating physican for assessment.  Best, Dr. Green

I would like to ask if you could possibly post again, with photos showing you at rest and making the face that elicits the different you are describing.  I have never seen this complication from injecting the levator labii superioris alaeque nasi, and also am not sure what a duck face is. I am thinking that the Botox spread to either the compressor narus or alar nasalis muscle, which are nearby. I have personally found that using concentrated Botox, just 1 cc for 100 units, prevents complications, as larger volumes spread farther. I would not say your doctor did something wrong, but just that it probably spread farther than intended, so next time, having a smaller and/or more concentrated dose will likely prevent this event.