Mouth guards (sometimes called mouth protectors) are important for protecting your teeth and mouth from damage. They are flexible plastic coverings worn over the teeth during athletic activities to prevent injuries such as broken or dislodged teeth, jawbone fractures, cerebral hemorrhage, and even neck injuries. They are also used to protect the teeth of individuals with a habit of grinding their teeth in their sleep.
Mouth guards work well to hold soft tissue, like lips and cheeks, away from your sharp, hard teeth in the event of forceful impact. This is especially important for individuals with orthodontic appliances, such as braces.
Most mouth guards cover only the upper teeth, but you may also use one for lower teeth if you have braces or a similar appliance.