I regularly suggest during my classes that students check in with and let go of any tension accumulating in the jaw and throat as a by-product of their efforts in order to help my students develop awareness of their stress reactions. Students often ask me what they can do to address their chronic jaw tension outside of class. I give them Lion Pose (which illicits dubious stares) and tell them to simply replace the stress reaction of tension with one of relaxation.
There is no quick fix for TMJ syndrome, grinding of the teeth, or other tension issues. Relaxation is hard work, but developing a keen awareness is the first step to overcoming the harmful habit of unconscious clenching of the jaw. For a few more fantastic tips on relief from jaw tension, here's Kiki in all of her infinite wisdom: