How many units of Botox to shrink masseter muscles? (Photos)

Historically, I have started with 20 units per side. I then have the patient come back in 1-2 weeks to see if more is needed. Seldom have I seen a patient that needs more than 30 units per side.Andrew Campbell, M.D.Facial Rejuvenation Specialist

Most patients require 30-40 units (total, for both sides) of Botox to slim the masseter muscles. This can be tailored to you needs. Often this treatment lasts a bit longer than other areas treated, 4-6 months.