An oral fixation device and a fixing method using the same. The oral fixation device includes a U shaped braces and an arch board. The arch board connects to an inner wall of the U shaped braces, wherein the thickness of the central of the arch board is larger than the connecting part. The maximum thickness of the oral fixation device is larger than 2 mm.一種口腔固定裝置及採用其之口腔固定方法。此口腔固定裝置包括一U型牙套及一拱型板。拱型板連接於U型牙套之內側壁,其中拱型板的中央處之厚度較連接處為厚。拱型板之一最大厚度大於2公釐。100...口腔固定裝置110...U型牙套111...U型上牙槽112...U型下牙槽120...拱型板210、220...內側端點310...內側壁W...兩內側端點210、220之距離L...拱型板120之一最大厚度
