Dental mouthguards and nightguards are protective devices for the mouth that help cushion and protect teeth from damage. Mouthguards are typically used to protect teeth during physical activities and sports, preventing injuries such as broken teeth and lacerations to the lips and gums. Nightguards are used to prevent damage from teeth grinding (bruxism) and clenching during the night. You can even wear your nightguard during the day if the grinding and clenching occur during the day.