What are the approximate number of units of Botox required for jaw reduction?

Inmost cases of master injections with Botox to shape the jaw we suggest about 50 units per side, plus or minus a few units depending on each case.

Hi there,
Thank you for your enquiry. From what I understand, you had a Dysport treatment to slim the muscles on both sides of your lower face, close to the jaw.
This muscle is called the masseter muscle. From my experience, this muscle can vary quite a bit in size. It tends to be bigger in male patients, people who go the gym a lot or clench their teeth at night. It is also often bigger in people of Asian origin.
Botox or Dysport relaxes the muscle. The bigger the muscle, the more Dysport or Botox is often needed to relax this muscle.
What you also need to know is that 2.5 units of Dysport equal only 1 unit of Botox. So in your case, when you say you had 100 units of Dysport, that equals 40 units of Botox.
Most people require 3 injections of 5 units Botox (equals 12.5 units Dysport) on each side. This can greatly vary from person to person depending on how big the muscle is.
With regards to the dermal filler in your chin, it sounds as if you had two injections on each side of the chin. Maybe the doctor or nurse injected a slightly bigger amount on one side compared to the other. This can cause asymmetry. If this was the case, it can be easily corrected. Another option could be to dissolve the dermal filler with an enzyme called hyaluronidase.