How many units of Botox will slim my jaw?

Hello and thank you for your question.  The
best advice you can receive is from an in-person consultation.  If you have hypertrophy of your masseter muscles, then botox can be used to slim the muscle.  I usually use 15-30U per side for this.   Make sure you specifically look
at before and after pictures of real patients who have had this surgery
performed by your surgeon and evaluate their results.   The most
important aspect is to find a surgeon you are comfortable with. I recommend
that you seek consultation with a qualified board-certified plastic surgeon who
can evaluate you in person.
Best wishes and good luck.
Richard G. Reish, M.D.  FACS
Harvard-trained plastic surgeon

Hello, Thanks for your query. Botox for slimming the face mainly involves to masseter muscle and requires around 24-28 units n each side. It works on the principle of disuse atrophy and takes about 2 months to start showing results. With repeated injection the dose required will reduce with time. Consult a board certified plastic surgeon.