It may not be international toothbrush day quite yet (that’s June 26th, in case you didn’t celebrate last year), but as far as we’re concerned, our teeth are our best friends. That’s why we wanted to take a few minutes to celebrate toothpaste, the unsung hero of good health and delicious breath. 1. Astronauts Normally Swallow Their Toothpaste in Space Back in the 1960s, NASA worried that their moonwalking employees wouldn’t be able to maintain their dental hygiene. As…