I've had jaw Botox about 3 times in total. Even though all Botox may seem similar, I guess it differs depending on the product.
The first time I got it, there was no difference even after 3 months, so I felt like it was a waste of money. But the second time, maybe because I got a different type (product), or because the doctor did it well, my face started getting noticeably slimmer within 2 months.
So the next time I got it, I used the same product again. For those planning to get jaw Botox, please keep this in mind!