In many countries, fluoride is added to water and toothpaste to make teeth stronger. But, when there is too much fluoride, it can be toxic. In Ethiopia, at least 16 million people are affected by this. Al Jazeera's Leah Harding visited the small town of Mojo, which is trying to fix its fluoride problem in a creative way. - Subscribe to our channel: aje.io/AJSubscribe - Follow us on Twitter: twitter.com/AJEnglish - Find us on Facebook: facebook.com/aljazeera - Check our website: aljazeera.com #AlJazeeraEnglish #Ethoipia #Fluoride