Interesting. I worked in dental and have never heard of using meds for that. I grind in my sleep and I wear a nightguard. It works well and I sleep better with it.
That said I take clonazepam to sleep sometimes. 1mg tablet. I'm not allowed to take it daily as my doctor doesnt want me to develop the tolerance. My doctor is quite uptight about benzos, sleeping pills, etc.
My understanding is that on any dosage, eventually you will build up tolerance and need more. I've heard directly from a friend who went down that road and became addicted to benzos and struggled to come off them. I dont think clonazepam is as addictive as say xanax, but it's good to be aware.