Abstract: The invention relates to an assembly for fixing a tube for medical purposes to a patient's mouth, the tube being fixed to the patient's head. According to the invention the assembly comprises a tube clamping means which can be attached to the tube in a detachable manner, which tube clamping means is provided with positioning means connected thereto, which position the tube clamping means during use with the help of flexible, detachable securing means that arc to be arranged around the patient's head, the tube clamping means being designed such that it can be clamped around the tube after arranging the tube in the patient's mouth without disturbing the location of the tube.