So just how do astronauts go to the bathroom and handle hygiene in space? Listen as former NASA astronaut Mike Massimino breaks down all the differences between using the bathroom, washing your hair, and brushing your teeth on Earth and in space. How do you take showers in space? Do you get a private bathroom on the International Space Station? Can you bring your own toothbrush into space? Mike Massimino is a former NASA astronaut, senior advisor for space programs at the Intrepid Museum, and professor at Columbia University.