Not everyone agrees with the outlook that “you’re never fully dressed without a smile” — actuallly, you might say that a number of celebs prefer to be a little, well, undressed. Those stars will usually avoid flashing their pearly whites on the red carpet, either to hide their less-than-perfect choppers or to appear more sexy.

Whatever the reason for keeping their teeth out of the public eye, they do occasionally catch us completely off guard with their face-changing smiles. In fact, people like Kylie Jenner, Taylor Swift, and even Kanye West look like entirely different people!

But don’t just take our word for it. *Scroll down for all of the celebs who are nearly unrecognizable when they smile versus when they’re in resting face. *