Will masseter muscle exercises help? (Photo)

Hello everyone, I have a question about the symmetry of my masseter muscles. I used to chew an absurd amount of gum and I mainly chew on my right side. So that led to my right masseter muscle becoming much larger than the left. So that makes me ask the question. Is there a way I could exercise the both masseter muscles so they can back to being symmetrical? Here is a picture of me flexing my jaw muscles. Thanks.