For masseter Botox injection to achieve jaw slimming, is it more effective to get 20 units divided over 3 injection points or 20 units in a single injection point?

It is more effective to inject the 20 units in the lower and more posterior parts of the muscle as the aim is to achieve a V shaped lower face, therefore the lower and posterior parts of the muscle should be targeted to shrink more.

By placing 20 units in one spot only, the doctor can not reach the other parts of the muscle and you may just get a overall sunken face rather than a slim tapering lower face.

Also , by injecting in the lower and posterior parts , the doctor can avoid Botox from
flowing in front to the risorius muscle , which will cause an asymmetrical smile .

Best Regards,
Dr Israr Wong