Home > News 15 March 2017 Health24 Health Challenge: Week 32 It's time for our weekly health challenge! Find out if you can score a perfect 10 on our quiz. 0 Joshua Carstens NEXT ON HEALTH24X QUIZ: How often do you take a sick day? 2017-03-30 13:32 More: News advertisement Other news News QUIZ: How often do you take a sick day? Diet and nutrition Sugar tax too low to work Medical QUIZ: 10 facts and myths about asthma Lifestyle High-tech acne treatments Medical What does the ADHD brain look like? Medical Could grinding your teeth cause headaches? From our sponsors How to care for your vaginal flora Live healthier Hello? » SEE: Interesting facts about hearing loss Earworms: Let it go Is it bad to sleep with earplugs all the time? SEE: Do women hear better than men? The reason why men often appear not to be listening could be because they actually can't hear you. Confident smile? » Acidic drinks can harm your kids' smiles The facts on bleaching your teeth Am I taking good care of my teeth? Why are my teeth stained? We know the rules – brush your teeth twice a day and floss to keep them healthy. But, have you ever wondered what causes those stains that sometimes appear?