The most common reason your dentist will recommend an occlusal guard is if they suspect you clench and grind your teeth. A night guard will protect your teeth from the damage of wear. It is important to understand that wearing a custom guard may not prevent you from continuing to brux your teeth, but the damage will be on the acrylic, not the teeth. The appliance design will depend on whether you are clencher, grinder or both and whether you have other symptoms.