Final answer:
After applying mascara, insert the used wand back into the tube and screw it closed tightly to prevent the product from drying out and to maintain hygiene.
Step-by-step explanation:
When you have finished applying mascara, it is important to put the used wand back into the mascara tube. This helps prevent the mascara from drying out and ensures that the product remains hygienic for further use. The wand should be carefully inserted back into the tube and screwed closed to ensure it is sealed properly. Avoid pumping the wand in and out of the tube, as this can introduce air into the tube, causing the mascara to dry out faster. Make sure the cap is tightly closed to prevent the mascara from drying and to maintain its longevity.