I clench and grind every night, i have done for many years, mine is due to stress, ive had mouth guards made, a soft one and also a hard one, neither helped, as the soft one was like silicone and made me bite onto it more, and the hard one was so uncomfortable it shifted my teeth to the side and made them very sensitive, i was put on Dothiopin which is a muscle relaxant at night, it did work and i was on it for many years but i found it still was working during the day and i couldnt wake up, so now i just take a Syndol occasionally which also relaxes your muscles as it is mainly used for tension headaches, but you must not take every night due to addiction.