A mouth guard is made of Ethylene-vinyl acetate (EVA) and used to protect the mouth, teeth, and gums during contact sports or sleep. Those who grind their teeth at night use a mouth guard to protect their teeth from damage. It is especially helpful to protect teeth during contact sports, such as football, basketball, and hockey to name a few.
You can buy stock mouth guards from any sporting goods or drug store to protect your teeth, but they do not fit well, and you cannot mold them to your teeth. If you buy boil and bite mouth guards they will fit a little better, but still not the way they should. The best choice for getting a mouth guard is to see your dentist.