THE ONLY WAY TO PERMANENT STOP THIS HABIT IS TO GET AND WEAR A BRUXISM APPLIANCE, NOT A MOUTH GUARD.

WHY?

GRINDING IS AN UNCONSCIOUS HABIT YOU DO WHEN SLEEPING.
WITH A MOUTH GUARD YOU'LL EVENTUALLY GRIND THROUGH IT.
THE NTI BRXISM APPLIANCE IS TOTALLY DIFFERENT.

IT NEVER ALLOWS YOUR TEETH TO TOUCH IN ORDER TO GRIND.

THE STRESS IF LIFE PROMPS YOU TO CLENCH AND GRIND.

EVERY NTI IS CUSTOM MADE AND MANY WHO HAVE IT MARVEL AT THE OUTSTANDING RESULTS.

did you try niteguard? it will not help permanently but will protect your dentition,
plus if you're a grinder, probably you will never stop, even when you think you stopped and you no longer feel discomfort or pain in your jaw you probably will still continue grinding but signals/impulses will no longer be recognized as foreign, thus you will feel normal with no pain etc. but you might continue grinding
talk to your dentist, but they will definately recommend nitegurd device
good luck