Maxillary and mandibular devices that increase the smallest concentric airway cross-sectional area of a user for improvements during physical activities

A mandibular repositioning device comprising:

• a maxillary piece configured to cover teeth of a user comprising a right side back teeth mold and/or a left side back teeth mold and a driver flange protruding laterally outward on either or both of the right side and left side back teeth mold, the driver flange having an anterior side with a convex curvature;
• and a mandibular piece comprising:
• a tooth covering having a protrusive flange extending cranially therefrom positioned to have a posterior side engaged with the anterior side of the driver flange, the posterior side of the protrusive flange has a concave curvature from a base of the protrusive flange toward a most cranial point of the protrusive flange which engages the convex curvature of the driver flange in a rest position and for continuous contact thereagainst as a user moves their jaw downward;
• a plateau of a preselected height between the base of the protrusive flange and the tooth covering, wherein the preselected height is set to prevent disconnect between the protrusive flange and a respective driver flange relative to a fully open mouth measurement between incisors of the user;
• and wherein the posterior side of the protrusive flange and the anterior side of the driver flange have a posterior lean in a respective vertical axis.