An oral orthosis for reducing snoring and sleep apnea symptoms includes a maxilla palate plate having a front edge at the front teeth, a back edge at the soft palatum and two sides edges at the molar rows and, attached thereon, a fixing mechanism to fix the plate in the oral cavity and a tongue positioning device. The tongue positioning device includes a pellotte attached to a pellotte bar mounted into the plate with a spring wire engaged to press the pellotte against the tongue when positioned in the oral cavity, wherein the pellotte bar is mounted in the maxilla plate near the front edge of the plate between the molar and cuspidate teeth plus or minus 5 mm.
