Does masseter botox always work?

I’m maybe being impatient as it’s only been a week, but I’m just wondering does masseter Botox generally always work(unless you have Botox resistance)?

I feel it worked really quick in terms of my clenching while I’m awake (still sometimes doing it but I’m more aware of it when I am and can relax my jaw) but I am still waking up with pain from grinding in my sleep, which is my main concern as my teeth are really suffering from it.

Does it sometimes take a bit longer, like after my second treatment I might feel more benefits? As I say maybe by next week I will feel more of a difference.