Talk to your local dentist about a guard to help manage the grinding. A baby teething ring may help, too.
Give them a clean wash cloth to chew on.
Ask the doctor to check their sugar. Sometimes if they have high sugar levels at night, the teeth grinding is worse.
If your loved one is grinding during the day, strike up an engaging conversation to keep them from grinding.
Also if it’s happening during the day, try giving them a piece of gum to chew on.