Before dental work shoud i take chlordiazepoxide to relax jaw?

Probably not: In general, there is no need to take chlodiazepoxide before seeing your dentist to relax your jaw. Certainly, do not take it or any prescription medicine unless it's prescribed for you by a doctor. Only if your see your dentist and he recommends and prescribes it, should you take chloridiazedpoxide. But generally speaking, no.

Yes: If you have tight muscles or if you grind your teeth, it would be helpful.

Ask dentist: Ask your dentist. He/she is in the best position to counsel you.