Superman, the Man of Steel, shaves by reflecting his heat vision off a mirror and onto his face. Heat vision shaving of his facial hair has been shown in multiple comics and cartoon adaptations, but it has raised concerns about practicality among some fans.
Superman's shaving routine suggests that he is able to control the intensity of his heat vision. Otherwise, the heat vision would presumably burn through a standard mirror; it has been shown to be powerful enough to combat fellow Kryptonians. Some fans have suggested alternate shaving options, such as using a fragment from the ship that brought Superman to Earth as a razor.