Has anyone had salivary gland Botox? What are the effects like? Is it different from square jaw Botox?

The skin under my ears and below my chin looked particularly bulging, so I thought I had gained weight. But after doing some research, I found out that it could be due to enlarged salivary glands! I heard that getting salivary gland Botox reduces their size and makes the jawline look much slimmer. Has anyone here at Maypure had this done? I've had square jaw Botox before, but I'm curious about the sensation during the injection and how much soreness there is afterward. Please share some real reviews, including whether you experienced any side effects!!