The mouth washing device includes an insertion groove into which a users teeth can be inserted, a body portion including a plurality of injection holes and a plurality of suction holes positioned on the inner wall of the insertion groove, A water supply pipe to be supplied, a drain pipe through which the cleaning liquid is discharged to the outside through a plurality of suction holes, and a conversion member for converting a jet direction and a suction direction of the cleaning liquid, wherein the body portion communicates with the plurality of injection holes And a second internal space communicating with the plurality of suction holes.口腔洗浄装置は、使用者の歯が挿入されることができる挿入溝と、挿入溝の内壁に位置する複数の噴射孔及び複数の吸入孔とを含む胴部と、複数の噴射孔に洗浄液を供給する給水管と、洗浄液が複数の吸入孔を介して外部に排出される排水管と、洗浄液の噴射方向と吸入方向を変換する変換部材とを含み、胴部は、複数の噴射孔と連通される第1の内部空間と、複数の吸入孔と連通される第2の内部空間とを含む。
