Now that Joe Biden doesnât have to wear a mask in public, Iâm back to staring at his teeth. Fact is, the last three presidents have elevated dental awareness to unprecedented levels. Whether cosmetically altered, artificially whitened or just naturally dynamic, teeth displayed by Obama, Trump and Biden have been downright mesmerizing. In official portraits of presidents displayed by the White House Historical Association, none of the first 39 presidents revealed a single tooth. This was partly due to dental crookedness and discoloration, but also because portraits and photos were usually viewed as serious business, resulting in somber, tight-lipped poses.