Abstract: An interocclusal sports prophylaxis includes a core having an arch shaped occlusal plate with upwardly extending buccal and lingual walls. A labial force dispersal shield and molar framing braces extend downwardly from the plate at incisor and lingual zones of the plate. The occlusal plate is thickened at the molar and incisor zones so that breathing spaces are provided between mandibular occlusal surfaces not registered with the zones and a mandibular face of the plate. A shock absorption dentition encasement is molded over the upper surface of the core and also covers the molar and incisor zones. The prophylaxis is heated in water, seated in the mouth and then biting pressure is applied to embed the maxillary dentition in the encasement and the lower incisor and molar occlusal surfaces in the encasement covering the zones.