Mouth guards are coverings worn over teeth, and often used to protect teeth from injury during sports. Mouth guards should be used by anyone both children and adults who play contact sports such as football, rugby, boxing, hockey. However, even those participating in non-contact 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.