Mouth guards are coverings worn over teeth, and often used to protect teeth from injury from teeth grinding and during sports.
Mouth guards should be used by anyone -- children and adults -- who play contact sports such as football, boxing, soccer, ice hockey, basketball, lacrosse, and field hockey. However, even those participating in noncontact sports (for example, gymnastics) and any recreational activity (for example, skateboarding, mountain biking) that might pose a risk of injury to the mouth would benefit from wearing a protective mouth guard.
Adults and children who grind their teeth at night should have a nocturnal bite plate or bite splint made to prevent tooth damage.