Mouth guards for teeth grinding are plastic dental splints fitted to your teeth. They are used to relieve excessive or incorrect pressure on your teeth and jaw, which can cause bruxism.
Teeth grinding and jaw clenching (bruxism) can wear down your teeth over time. As the mouth guards are softer than the tooth enamel, tooth wear is prevented. The splint itself is about 1 mm thick and thus increases the distance between the jaws. This helps to prevent unconscious clenching and grinding.