Botox in masseter slimming one side faster? Is it possible that it is taking effect at different rates? (photo)

Thank you for your question.  It takes approximately 2 weeks for the full effects of Botox to show, especially when injected into a large muscle such as the masseter.  I would wait the full 2 weeks before making a definitive comparison between the sides.  That being said it is not at all uncommon to have one side which is larger than the other.  This is secondary to several factors, but does not necessarily mean there is anything wrong with your Botox treatment.  You may simply may need a booster dose on this side which is more active.The sure you are consulting with a board certified injector who has experience with Botox injections, specifically in the masseter muscle.I hope that this helps!–David Gilpin

It's difficult to tell from your picture. Keep in mind, it can take 1-2 weeks for final results with Botox. If necessary, a touch-up of Botox can improve asymmetry. See an expert. Best, Dr. Emer

I would leave it alone.  From what I can see you look beautiful....don't over analyze.  The difference is barely perceptible in the photos you have provided.