It could be caused by several facors, not withstanding are stress, suppressed anger, frustration and/or medications. Chronic teeth grinding can result in a fracturing, loosening, or loss of teeth. The chronic grinding may wear their teeth down to stumps. You can wear a mouth guard that's available in most sports stores but if it continues, you should see your doctor. Good luck!
I have had chronic teeth grinding 24/7 since I can remember. I have jawbone, sinuses and ear problems, quite probably related. I have more partials than original teeth and grind them the same. I find I am constantly grinding, twitching or tensing and relaxing a muscle to some silent beat in my head like the racing thoughts. I make a conscious effort to control and stop the grinding but like the racing thoughts as soon as my attention is not solely focused on not grinding my teeth I suddenly realize that I'm doing it again. If you or anyone has come upon any helpful information referrals since on this subject, please share this info with me. Thanks.