Lilith, I and my son have had to use mouth guards before because of grinding our teeth in our sleep. My guard was from the dentist and cost a fortune! His was a simple mouth guard you can buy in any sporting goods department, like athletes wear, and worked just as well (his dentist recommended this). You might want to try one of these first to see how you react to wearing it. Just dip the mouth guard in VERY hot water for a second or two and put it in your mouth and bite down, it will conform to your teeth to fit like it should. Hope this helps.

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I like the bed I'm sleeping in, just like me it's broken in; it's not old -- just older.
Like a favorite pair of torn blue jeans, this skin I'm in it's alright with me; it's not old -- just older.....Bon Jovi