There are several negative health effects associated with BPA. There is new research that suggests the container in which food is kept has the potential to leach BPA into food. As a result, manufacturers are constantly working to make plastics as safe and BPA-free as possible. A BPA-free plastic may not be 100% safe, but it does decrease the risks associated with BPA significantly. You may want to consider going BPA-free when it comes to your tortilla warmers, but also for any plastic food ware that you may be using.