While you may have heard that sugar is bad for your teeth, you have probably not heard that saltine crackers are bad as well. Like, really bad. Saltine crackers are made of a fermentable and highly processed type of starch. They are very processed and contain ingredients that wear your teeth down and hurt the enamel. The ingredients increase the glycemic index, which increases how cariogenic the food is (cariogenic means cavity-causing). So next time, think twice before dumping a whole box of these into your soup!