Film clamping element

A film clamping element, for carrying out dental treatment in the mouth area of a patient, comprising a vestibular ring (14) and a lip ring (12), between which and beyond which a film (16) extends, which film is held in a stretched manner by the rings, wherein the film (16) and the rings are elastically deformable by the application of forces between an upper side of the film clamping element and a bottom side of the film clamping element, wherein the vestibular ring (14) can be pressed together into a substantially oval shape by pressing together an upper side and an opposite bottom side thereof, wherein

• the vestibular ring (14) comprises a recess on at least one circumferential point, on the upper side and/or the bottom side, the width of said recess being greater than the width of a frenulum and smaller than the radius of the vestibular ring (14), and
• a pre-loading corset or lip support corset for the film (16) extends at least partially between the vestibular ring (14) and the lip ring (12) which brings the shape of the film (16) closer to a target shape in the inserted state.