After my orthodontic treatment, I developed a really strong habit of clenching my teeth, so I got masseter Botox (I was clenching hard in my sleep, so my jaw hurt in the morning T_T). Other than the feeling of the medicine going in during the procedure and the lingering sensation of having had the injections for a few hours, I didn't feel anything else, and there were no side effects.
The consultation was only with the coordinator... A young male doctor administered the injections, but I don't know his name. My masseter muscle isn't very prominent, so there wasn't a big change in the face line, but it was very effective for improving the habit of clenching my teeth!!!! After 6 months, I'm planning to go back for another round soon haha