Yes, the parallelogram objects have Order 2 rotational of symmetry. Parallelogram, is a type of quadrilateral having four sides, its opposite sides are equal and parallel to each other. A parallelogram provides a same view after its rotation.
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Most of the whitening products we use in our office have a shelf life of 18 months. Once the whitening strips expire, they will not cause any harm to your teeth, but their whitening effectiveness may be reduced or even completely eliminated. For best results, use your whitening strips BEFORE they expire.