Gum shields are very neccessary for sports.They provide protection for teeth and jaws. Sometimes, gumshields can't always protect injuries but not wearing them at all can lead to crtical injury.
Gum shields are necessary for contact sports where the athlete needs to protect their teeth. Football players often have gum shields on a small strip attached to the face mask to help protect them from having teeth knocked out in violent contact that goes on in the game. It is a good protection.
Yes gum shields are necessary in sports. This protects the athletes teeth against objects as well as other body parts from their opponants. Such as: hands, elbows, and feet.