The present invention relates to a retainer (1, 1') cooperating with a plurality of teeth and suitable for stabilizing the teeth, said retainer (1, 1') comprising at least one elongate arch (3), wherein the arch (3), overall, has a curved shape following a natural curvature of a lower jaw or of an upper jaw and, locally, is individually adapted to a surface contour of a respective adjoining tooth, wherein the retainer (1, 1') is made of a metal and is worked from a plate-shaped part, in particular a sheet, of the metal that has two surfaces (19) arranged parallel to each other. In order to produce a retainer that avoids the disadvantages of known retainers (insufficient durability, accidental activation, blocking of the teeth), it is proposed according to the invention that the metal is formed from a nickel-titanium alloy, more preferably from Nitinol, and a work surface (13) of the retainer (1, 1'), in the installed state thereof, faces towards a tooth surface (17) on which the retainer (1, 1') bears, and a top side (2) or an underside (11) of the retainer (1, 1') corresponds to an original sheet metal plane. The present invention further relates to a method for producing such a retainer (1, 1').
