Provided is a negative-pressure attaching dental pad, comprising a retaining plate (2) and a groove (14)； the lower half of the dental pad is designed have a curved shape according to the deformation of the tracheal tube in the oral cavity. The groove (14) has a unidirectional exhaust vent (113)； there is a relatively large gap (115) between the groove (14) and the tracheal tube (2)； after forcibly pressing the air out, the gap (115) is significantly reduced, and the interior thereof becomes negative pressure, thereby attaching the tracheal tube (2) to the dental pad； then a syringe is used to draw air out by means of the unidirectional exhaust vent (113) to increase the internal negative pressure in the gap (115) between the dental pad and the tracheal tube (2). By means of the negative-pressure attaching design, the greater the negative pressure, the more firmly the fixation is； furthermore, the negative pressure can slightly increase the airway of the tracheal tube (2), such that the dental pad and the tracheal tube (2) attach together； the occupied volume of the oral cavity is small, alleviating the suffering of patients and facilitating oral care, and furthermore, only one person is required to proceed, reducing human labor.L'invention concerne un coussinet dentaire de fixation à pression négative, comprenant une plaque de retenue (2) et une rainure (14) ； la moitié inférieure du coussinet dentaire est conçue de manière à présenter une forme incurvée en fonction de la déformation du tube trachéal dans la cavité buccale. La rainure (14) présente un orifice d'évacuation unidirectionnel (113) ； un interstice relativement grand (115) existe entre la rainure (14) et le tube trachéal (2) ； après l'expulsion forcée de l'air, l'interstice (115) est significativement réduit et l'intérieur correspondant devient à pression négative, ce qui permet de fixer le tube trachéal (2) au coussinet dentaire ； ensuite, une seringue est utilisée pour aspirer l'air au moyen de l'orifi
