Stress can cause tooth grinding. It can even be a limited stress that you are not even aware of.
For about a year, working at the Center I work at, I was in a very stressful position. I began to clench my teeth and grind my teeth when I was asleep and when I was awake but not, well, aware of it.
I ended up with the clicking jaw from the damage. I no longer do this since I went to a different shift and my stressors changed, but the jaw clicking is now in my mouth permanently.
I also got headaches, I did have constantly aching jaws and it did hurt to chew.
As for the medication, I haven't seen any side effects such as teeth grinding/clenching with Zoloft.
quote:
What are the possible side effects of sertraline [Zoloft]?
If you experience any of the following serious side effects, stop taking sertraline and contact your doctor immediately or seek emergency medical treatment:
an allergic reaction (difficulty breathing; closing of the throat; swelling of the lips, tongue, or face; or hives);
an irregular heartbeat or pulse;
low blood pressure (dizziness, weakness);
high blood pressure (severe headache, blurred vision); or
chills or fever.
If you experience any of the following less serious side effects, continue taking sertraline and talk to your doctor:
headache;
tremor, nervousness, or anxiety;
nausea, diarrhea, dry mouth, or changes in appetite or weight;
sleepiness or insomnia; or
decreased sex drive, impotence, or difficulty having an orgasm.
Side effects other than those listed here may also occur. Talk to your doctor about any side effect that seems unusual or that is especially bothersome.
http://health.yahoo.com/drug/d00880a1#d00880a1-sideeffectsThe anxiety and such can be from the Zoloft which may in itself cause you do do the jaw clenching.
If you have concerns, why not speak to your doctor?