Removes all of your makeup after you've had a long night of fighting off Dementors (or dancing, whatever) and do not have the energy to do that ish.
Places a protective shield over the surface of your teeth, so your lipstick doesn't transfer onto them, keeping your pearly whites as gleaming as Professor Lockhart's.
Eliminates unwanted body hair, leaving your skin as hairless as a house elf's.
Evens out your blotchy self-tanning job, so you don't look like a walking vomit-flavored Bertie Botts bean.