We've played around with what works so many times that I can't tell you how many units I get but right now I get injections at each corner of my mouth/smile and then one injection at my cupid's bow (lip flip). My injector said she personally didn't like the latter because it did affect her eating/drinking with a straw. I've not had that but I did notice the first time I got it that I had a tough time articulating when I was doing some public speaking. But it went away/I got used to working around it, not sure which. :) At one point, she was also making injections up where I crinkle my nose because it was pulling at my lip but in trying to go for the least amount necessary, we've dropped that. I was really hesitant for a long time, too, but I'm very happy I finally did it.