I have an asymmetrical smile. Is this a muscle problem? (Photo)

Hello, Many thanks for your question.
It does appear that you have a muscular imbalance in your smile.
This could be a weakness in a muscle or nerve on one side of the face, or an over compensation of a muscle.
A consultation would be required to determine the correct course of treatment. Botox treatment could be considered in this scenario.

yes, it's because of asymmetry in muscle and its activity. You can visit a physiotherapist for muscle activity correction exercises. You can also take Botox for asymmetry correction, botox is not a permanent solution.

She needs to be clinically evaluated, according to the image she presents facial paralysis of the facial muscles on only one side of the face.