You can re-wear your stick on bra / nipple covers as many times as you like, provided they are cared for correctly and stored properly.
Make sure you hand wash both after every use and store them sticky side down on the plastic sheets they come with. This is essential to prolonging the life of your stick on bra / nipple covers and means you’ll get the most wear out of your purchase! Hand wash in mild soap and air dry completely before placing them back on the plastic sheets. This will keep the adhesive sticky.
If you do find that your stick on bra / nipple covers have lost some stickiness, simply hand wash them in mild soap and air dry to retrieve stickiness.