The true story is that Freddie had four extra teeth, which were known as mesiodens or supernumerary.
They were four incisors which pushed his front teeth forward, meaning he had a massive overbite which looked so distinctive some even thought it was fake.
At one point in Bohemian Rhapsody, Freddie’s teeth are mentioned, when he approaches a young Brian May and Roger Taylor about joining their band, to which they reply: “Not with those teeth, mate.”
In the movie, Freddie replies: “I was born with four additional incisors, so the filmmakers wanted to make sure the truth was shown.