Can someone assist me in understanding a very odd symptom I seem to have when I start a new course of probiotics -- my jaw becomes tighter and I find myself clenching my mouth and teeth during waking and sleeping hours. I have this sense that I am holding my jaw, as opposed to it being relaxed in my mouth.

I have mercury poisoning and I am currently chelating with DMSA 3 days on 11 days off. I am feeling well enough to start probiotics, but I am deeply puzzled by this symptom and wonder if it is a sign to stop or keep moving through it.

I can imagine the gut has a great deal to do with teeth clenching, I just don't know why. Any ideas??

thanks.