If you grind your teeth while you're asleep, you may need to wear a mouth guard or mouth splint at night.
Mouth guards are similar in appearance to those used in sports such as boxing. They're usually made out of bendy rubber or plastic and can be made by your dentist to fit your mouth. You'll usually have to pay for this type of custom-made dental appliance.
Mouth splints are no more effective than mouth guards in reducing the symptoms of bruxism although they tend to last for years, whereas mouth guards usually last for less than a year. However, mouth splints are more expensive.
Although mouth guards and splints may help reduce muscle activity in your jaw at night, they're only able to control the condition, not cure it.