Home > News 15 February 2017 Health24 Health Challenge: Week 28 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 SEE: Can your liver handle the alcohol? 2017-02-16 15:29 More: News advertisement Other news News Win R5 000 with the Health of the Nation Survey Sex Sex: the pleasure without the pain Medical SEE: This movie scene is so sad it’s used in depression studies Medical Here’s why swimming is good for asthmatic kids Lifestyle SEE: 10 mind-blowing images of the human body Medical ‘My depression went undiagnosed for almost 20 years’ From our sponsors 10 facts about diabetes and insulin you need to know How to care for your vaginal flora JHB - Free Caregiver Workshop with TENA experts - 15 February JHB - Free home visit and assessment with a TENA nurse advisor 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?