Breadcrumb Home The six worst foods for your teeth Friday, August 30, 2013 Wall Street Journal http://www.examiner.com/article/the-six-worst-foods-for-your-teeth A 2008 University of Iowa study showed that enamel wear increased after a 25 hour steep in high sugar drinks like soda, sports drinks, and sweetened teas, with Gatorade topping the list.