I usually use 20 to 30 units of botox in the masseter muscle to decrease the prominence of it. The results can be that the muscle becomes less prominent and jaw area become less pronounced and the lower third of your face become more slimmer. Botox in the masseter muscle has been shown to last longer when used in this area.

Instead of 3-6 months, people have benefits for up to 6-9 months in some studies. The charge for botox ranges from 9-16 dollars per unit. The other way to shape the lower third is to take out bone through the mouth which is a much more involved procedure.