Muscles Involved and Action The masseter muscle is a thick, rectangular muscle of mastication, and it’s one of the strongest muscles in the body. It has two parts, superficial and deep, which play a crucial role in closing the jaw by elevating the mandible. Hypertrophy of the masseter muscle can lead to an undesired square-shaped facial appearance. Landmark The masseter muscle can be...

DAXXIFY is a botulinum toxin type A produced by the bacteria Clostridium botulinum. It is designed for the temporary improvement in the appearance of moderate to severe glabellar lines, or frown lines between the eyebrows, in adult patients. Daxxify comes in single-use vials containing 50 units per vial. Ingredients include daxibotulinumtoxinA-lanm, human serum albumin, trehalose, and...