I too, clench my teeth and have TMJ issues. I believe hypo/manic phases especially are very stressful and have a great impact on our bodies. Depression can make me feel tired and generally ill, worn down etc, and no doubt stressful, but hypo/manic is like I'm burning myself up from the inside out. Just completely worn out and unable to stop even when exhausted. Sometimes I feel like my whole body is clenched, not just my teeth, lol. Very stressful.
I'm sorry about your daughters dx. It can be alot of trial and error in the beginning with meds, but once they figure out what works for her, (and it's different for almost everyone), it's quite treatable.
Take Care and have a good day
Good judgement comes from experience and alot of that comes from bad judgement.