1. Because of facial fat, 2. Because the facial masseter muscle is developed, 3. Because the facial bones are unbalanced, the face is square and wide.

At present, "face-lifting" is injected with botulinum toxin, and its principle of action is mainly to paralyze motor nerve units that dominate muscles. After this injection is injected into the facial masseter muscle, part of the masseter muscle will gradually become paralyzed, the muscle will gradually become useless and atrophy, and the masseter muscle will gradually become thinner, thus achieving the effect of "slimming". However, the duration of drug action is usually 4~6 months.