Clever! Although I’ve noticed a lot of these types of ads wouldn’t explain themselves to a lot of people. They either would have to look at it for a while (which I feel great advertising needs to take a few seconds to be understood) OR read the teeny tiny small print down the bottom “Don’t coffee-block your smile”. Then you have the image of teeth whitening gum, the product.
Making that line bigger would increase the amount of people who go “AH! CLEVER!” but oh well, I still <3 these neat ideas!