PROBLEM TO BE SOLVED BY THE INVENTION The present invention is to solve the problem of unpleasant feeling and the like occurring when using a known anti-blocking device, by improving the condition of the head caused during sleep. SOLUTION: The present invention relates to an oral cavity opening and an upper tooth row. Comprising: a tongue portion an upper jaw located at one of the anterior superior teeth rows separated from the tongue portion and an uvula connected to one of the upper jaws away from the oral cavity opening, the nasal congestion eliminating nose What is claimed is: 1. A preventive device comprising: a straightening member which includes a left tooth area and a right tooth area which are symmetrically installed and which is attached to the upper tooth tooth row and a straightening member connected to the left tooth area and the right tooth area, And a turbulent flow member extending in the direction of the maxilla and disposed between the uvula and the oral cavity opening, wherein interference of air sucked through the oral cavity opening by the turbulent flow member , Soft tissue in the oral cavity does not shake due to the flow of air, improving users condition.(FIG.【課題】本発明は、睡眠時に発生する鼾の状況を改善し、周知の鼾防止具を使用する際に発生する不快感等の問題を解決することにある。 【解決手段】本発明は、口腔開口と、上歯歯列と。舌部と、前記舌部から離れた前期上歯歯列の一方に位置する上顎と、前記口腔開口から離れた前記上顎の一方に連接する口蓋垂とを包含する口腔内に使用する鼻詰まり解消鼾防止器であって、対称的に設置する左歯エリア及び右歯エリアを包含し、前記上歯歯列に取付ける矯正部材と、前記左歯エリア及び前記右歯エリアに連接し、前記矯正部材から前記上顎の方向に向かって延在し、前記口蓋垂と前記口腔開口との間に設置する乱流部材と、を包括しており、前記口腔開口から吸引する空気を前記乱流部材によって干渉することで、口腔内の軟組織が空気の流れによって震動することがなくなり、ユーザの鼾の状況を改善している。【選択図】図4
