Fig. 3. Injection points of botulinum neurotoxin for targeting depressor angulii oris muscle. The dotted line is drawn vertically at mid-pupil point, mid-pupillary line (MPL), and the transverse dotted line is drawn in middle of line crossing the cheilion and tragus and the mandibular border. The intersection point of dotted lines is injection point (orange colored dot) for the muscle with 2–3 U. This would be easily applied by placing index finger (15 mm width) for caucasions (A) and little finger (12 mm width) for Asians (B) along the lower margin of the mandible.
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