Plastic closure having an integrity guarantee element

A plastic closure having a lower part with a drinking spout and a cover which is connected in one piece to the lower part by means of a hinge and comprises a sealing plug which can be engaged in a locking manner with the drinking spout, said sealing plug being molded on the inner side of a cover surface, wherein the lower part and the cover each comprise a jacket wall, which stand at least approximately flush one above the other in a closed state of the plastic closure, and wherein the plastic closure further comprises at least one integrity guarantee element, and wherein the cover jacket wall is provided with at least one locking hook molded on the outer side opposite the hinge, and a first apron directed towards the cover and extending over less than half the circumference is provided on the lower part opposite the hinge and above the jacket wall of the lower part, in which first apron at least one hook locking window is formed, and a second apron running concentric with the first apron is provided, which second apron is offset inwards by at least the thickness of the jacket wall of the cover in this region, and wherein the at least one integrity guarantee element, which is separable during the first opening of the plastic closure by a rotating motion of the cover relative to the lower part, is a partial region of the jacket wall of the cover and is provided with the at least one locking hook, wherein the integrity guarantee element is completely separated from the jacket wall apart from securing ring predetermined breaking point bridges, and wherein the integrity guarantee element has the shape of a rectangular plate and is at most of equal height to the cover jacket wall, wherein a predetermined lateral breaking point bridge in each case forms the connection to the laterally adjacent cover jacket wall at least at the lateral edges of the integrity guarantee element.