How good is your dental hygiene? Carry floss with you in case of emergencies? Have a small bottle of mouthwash in your dashboard? If your friends think you are obsessive with the way you clean your teeth, then maybe you should move to Korea, where brushing your teeth isn’t just a matter of hygiene, it’s a lifestyle. Martina recorded the great extent to which her school cares about the state of its teeth. You’ll be surprised.