"Do dentists know you've given head" is a sexually explicit phrase that has been the subject of much discussion and debate. There is no scientific evidence to support the claim that dentists can tell if someone has performed oral sex, and many experts believe that the phrase is simply a myth.
Despite the lack of evidence, the phrase has persisted in popular culture and has been used in a variety of contexts, including jokes, innuendos, and even as a form of harassment. In some cases, the phrase has been used to shame or humiliate people, particularly women.