There’s this ad I keep seeing that I really despise. It’s for teeth-whitening toothpaste. The actress is wearing a white coat then holds up a tissue to her teeth, lamenting that her sparkling white teeth are ‘still yellow’
They cut away to teach you how toothpaste works, because surely you’ve never heard of this newfangled thing, and when they cut back she’s no longer wearing her white coat and says how much whiter her teeth are.
It’s transparently obvious that the wardrobe and tissue are just to give you something whiter to look at. But like… your teeth aren’t supposed to be freakishly white. It’s just something that Big Toothpaste wants you to feel bad about the way your body is. Also, using whitening toothpaste when you don’t need it can damage your enamel and cause you long term problems.