If it's more serious, your dentist can balance your bite. Because oftentimes when we grind our teeth, our bite becomes crooked and if your dentist balances your bite that will often relieves the symptoms.
The next more aggressive therapy is a bite plate. Your dentist can make a little plastic device that is custom made for your teeth that clicks on that will prevent you from grinding your teeth in your sleep.
And finally, in advance cases, you may need surgery in your jaw joint just as you might on your elbow, from tennis elbow, or your knee if you have arthritis from too much athletics.