Good question, no. It’s too late to edit my original comment but I went probably every two or three months for a few years. The relief was immediate and continual and the migraines, back spasms, etc. never returned but I did get maintenance injections. I don’t know how to describe it but I could kind of feel that was wearing off. Like I feel my jaw muscles getting stronger and that’s when I’d make an appointment to go back. Eventually the follow-up appointments started to spread out further and then they stopped. I still don’t chew gum, though. As soon as I chew gum I can feel those muscles wanting to bulk right back up!
It’s my understanding that Botox weakens the muscle and people who clench/grind their teeth have very strong muscles so you kind of keep going until the muscle is atrophied(?) down to a normal strength. So I would imagine the earlier you go for treatment the shorter the amount time you’d require treatment and vice versa. For more severe cases there’s actually a visible difference in your face, too. It’s too subtle for most people to notice but I can look at photos of myself and tell you whether it was before or after I started botox. When your jaw muscles are so strong it makes your face more square.
Here’s a good example of what I’m talking about: https://www.realself.com/photos/botox/botox-for-tmj#media-ph...