A kind of oral cavity jetter is suitable for spraying liquid in one oral cavity of what, and includes a hydro-peening head and an injection tube. The hydro-peening head front end can protrude into the oral cavity, and define a water stream channel and it is several spread what front end at each interval and be connected to the spray of the water stream channel release hole. The injection tube is removably combined for the hydro-peening head, and define the appearance liquid space that can be accommodated liquid and be connected with the water stream channel of the hydro-peening head, liquid in the appearance liquid space can be injected the water stream channel by the injection tube, and is released hole via spray and spurted into what oral cavity. The scouring force that ejection can be mitigated by the design that hole is released in spray was avoided that stimulated intraoral wound, and liquid is equably sprayed to what oral cavity, and hydro-peening head is made to slow down of soft flexible materials and collides feeling of pain caused by wound.一種口腔噴洗裝置，適用於將液體噴於一個口腔內，並包含一個噴洗頭及一個注射筒。該噴洗頭前端可伸入該口腔，並界定出一個水流通道，及數個彼此間隔地散布於前端並連通該水流通道的噴釋孔。該注射筒供該噴洗頭可拆離地結合，並界定出一個可容納液體並與該噴洗頭之該水流通道相連通的容液空間，該注射筒可將該容液空間內的液體注入該水流通道，並經由噴釋孔噴射入於口腔內。藉由噴釋孔的設計可緩和噴出之沖刷力，能避免過於刺激口腔內的傷口，並將液體均勻地噴灑於口腔，且噴洗頭由柔軟可撓性材質製成還能減緩碰撞傷口所引起的疼痛感。
