If you often eat snacks or do strenuous exercise, the masseter muscle will become bigger, because the muscles on your face will unconsciously tighten when you are nervous or exert yourself, and the masseter muscle will naturally develop after a long time, so it is best to do aerobic exercise or eat more foods with high potassium. Potassium is very helpful for masseter, or it is also good to eat a thin face fruit every day, and potassium is also rich in it.