A mandibular advancement device including upper and lower dental plates whichoperatively fit over at least part of the upper and lower teeth of a user, said upperand lower dental plates being made from a flexible material, the lower dentalplate having two pairs of spaced apart pillars, each pair consisting of an anteriorand posterior pillar, said pairs being on opposing sides of the lower dental plate,two removably attachable horizontal displacement inserts, mounted in the buccalregion on opposite sides of the upper dental plate, two removably attachablevertical displacement inserts mounted in the lower dental plate, placed in amanner to provide correct vertical registration of the teeth, such that operativelyeach horizontal displacement insert is retained between the respective anteriorand posterior pillars to maintain an advancement of the mandible. A method forproduction of the mandibular advancement device is also claimed.
