No! We do not recommend baking the polymer clay pieces at any higher temperatures than what is listed on the package instructions. At higher temperatures the polymer clay starts to degrade and break down and generate noxious fumes, while not acutely toxic, they are an irritant to the eyes, nose and mouth. We recommend baking at the baking temperature and times listed on the package and using an oven thermometer to ensure your oven is reaching and staying at the desired baking temperature.