The present invention is a mouth guard which is worn to protect a person's teeth when the person is engaged in a sports activity such as football. A strap which has a quick release mating member at each end interconnects the mouth guard with a bar on a helmet worn by the person. One quick release mating member is removably connected to a bar on the helmet and the other quick release mating member is removably connected to a receiving member in the mouth guard. In the event of a collision between participants in the sport which results in the helmet flying off the person's head, one or both of the quick release members will disengage the strap from either the bar on the helmet, the mouth guard, or both to thereby avoid damage to the person's teeth.