2、asseterof25casespatients,50Udosageasseterhypertrophyentof50UbotulinustoxinA,but4patientsdisplayednoasymmetryhypertrophyofmasseterstill,hoenttoxintype-Ainjectionisasafety,effectiveandconservationmethodforhypertrophyofmasseter.Longtimeresultsshouldbeviee. Ke