It's usually attributed to stress, but the link below also says that it can be caused by missing teeth or an abnormal bite. It doesn't go on to explain why, though. Grinding teeth isn't only annoying to the person who has to listen to it, but can wear down the enamel on the teeth and affect the jaw.
If the grinding is stress-related, then relaxation techniques or other stress relief methods might reduce the grinding, but some doctors recommend mouth guards that keep the teeth from grinding together at night. Muscle relaxers are also used sometimes.
A lot of the problem is most likely stress. I used to grind my teeth before I got a divorce. I tried a lot of things, including counseling.
They told me to try the Yuen Method, so I did and it worked for me. There are free classes online to learn it here yuenmethod.com/store/cart.php.
There are several things that could be causing your husband to grind his teeth. This could be stress or anxiety, abnormal bite, new dental fixtures or fillings, or it could have just developed out of habit. To stop this, you should be sure he sees a dentist, if he hasn't already to check his dental bite.
If this is severely unaligned then it could be the reason for the grinding. Also, if he has a new filling or other dental work, contact your dentist to see if there could be a reason that this is occurring. If this is caused out of stress, perhaps finding ways to relax before bed would curb the teeth grinding.
If not, then maybe investigating the cause of the stress is needed.
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