to lie within the mouth of an athlete consists of an occlusal posterior pad made of quadruple composite material comprising four layers of distinct materials further comprising a first layer of a durable resilient material a second layer of non softenable flexible material a third layer of a hard very durable material and a fourth layer of a softenable material engageable with the occlusal surfaces to space apart the upper and lower teeth to absorb shock and clenching stress an adjustable arch adapted to expand and contract to be molded to the palate is provided connecting the posterior pads together within the mouth and out of the way of the tongue to maintain the position of the occlusal posterior pads within the mouth during use and to prevent loss of the pads such as by swallowing an expandable serpentine bridge may be embedded in the arch application_number US 65857900 A description to understand the structural features and benefits of the dental appliance 70 of the present invention some anatomy will first be described referring to fig1 and 1a the user or athlete has a mouth 10 generally comprised of a rigid upper jaw 12 and a moveable lower jaw 42 which are movably.