A method of custom fitting a mouth piece includes providing a self-impression kit with at least one dental impression bite registration tool, impression material, and instructions. The instructions direct the steps of: a) determining a natural or symmetrical bite position of a subject utilizing the bite registration tool； b) applying impression material to an intraoral portion of the bite registration tool； c) placing the bite registration tool and the impression material in the subject's mouth； d) forming an impression of the subject's teeth and gums in the impression material by the subject biting on the intraoral portion of the bite registration tool in the previously determined natural bite position； and e) delivering the bite registration tool and formed impression material to a manufacturer to have a bite regulator fabricated using the formed impression.
